Product Description
SEAKOSS GMT 1963 Watch – Seagull ST2557 Movement, Sapphire, 100m, 45mm
The SEAKOSS GMT 1963 is a large automatic GMT watch built around the genuine Seagull ST2557 movement — a true GMT caliber with a central 24-hour hand for tracking a second time zone, alongside small running seconds and a date display. Sapphire crystal. 316L stainless steel case with a screw-down crown. Comfortable silicone strap. 45mm diameter, 17.5mm thick, 100m water resistance.
Key Specifications
| Specification | Details |
|---|---|
| Brand | SEAKOSS |
| Movement | Seagull ST2557 automatic GMT |
| Jewels | 30 |
| Frequency | 21,600 vph |
| Power reserve | ~40-45 hours |
| Functions | Hours, minutes, central 24-hour GMT hand, small seconds (9 o’clock), date (3 o’clock) |
| Case material | 316L stainless steel |
| Case diameter | 45mm |
| Case thickness | 17.5mm |
| Crystal | Sapphire |
| Crown | Screw-down |
| Strap material | Silicone |
| Band width | 24mm |
| Band length | 21cm |
| Water resistance | 100m (10 ATM) |
| Dial colours | Blue/green, black/blue, white, black/pink |
Seagull ST2557 — Genuine GMT Movement
The ST2557 is a documented, real automatic movement from Tianjin Seagull. Its defining feature is a true GMT function: a central hand that completes one full rotation every 24 hours, tracking a second time zone simultaneously alongside the standard hour and minute hands — distinct from a simple dual-sub-dial “second time zone” display found on some other watches. Small running seconds sit at 9 o’clock, and the date window sits at 3 o’clock. With 30 jewels and a beat rate of 21,600 vph, it offers approximately 40-45 hours of power reserve from full wind.
GMT Function — How It Works
For practical use, the central GMT hand can typically be set independently at the first crown position, allowing it to track a second time zone (such as a home time zone while travelling) without affecting the main hour and minute hands. This is useful for anyone managing communications or schedules across regions, distinct from simply owning two watches set to different times.
Sapphire Crystal and 316L Stainless Steel
Genuine sapphire crystal protects the dial — Mohs 9 hardness, scratch-resistant under normal daily wear. The 316L stainless steel case is a corrosion-resistant grade well-suited to a watch intended for daily and active use.
100m Water Resistance — What It Actually Means
Rated 100m (10 ATM), which under standard water resistance guidance supports swimming and showering, not just splashes. This is a genuinely robust daily-use rating. However, 100m water resistance alone is not the same as a certified dive watch — true dive watches carry ISO 6425 certification with additional testing for things like resistance to magnetic fields, shock, and a unidirectional timing bezel, none of which are claimed in the available specifications for this watch. Treat the 100m rating as confidence for swimming and everyday water exposure, not as a substitute for a purpose-built dive watch if you actually plan to dive.
Silicone Strap and Screw-Down Crown
The 24mm silicone strap is designed for comfortable, secure daily wear, complementing the watch’s larger, sport-oriented case. The screw-down crown helps maintain the water resistance seal when fully closed — always ensure it’s screwed in before any water exposure.
Size and Wrist Presence
At 45mm diameter and 17.5mm thick, this is a large, substantial watch — buyers should confirm this size suits their wrist before ordering, as it sits well above the 40-42mm range common to most everyday watches.
Dial Colour Variants
Available in blue/green, black/blue, white, and black/pink combinations, giving a range of sport-oriented colour options across the same case and movement specification.
Related Watches
For genuine chronograph functionality using a related Seagull movement family, see the SEA-GULL 1963 International Edition, the Sugess 1963 Panda Pilot Chronograph, or the TOPHILL TL025G 1963 Chronograph — all genuine ST1901 column-wheel chronographs. For another open-heart Seagull automatic, see the SEA-GULL D819 Open-Heart Watch.
FAQ
Does this watch have a chronograph function? No. Despite some marketing material listing “chronograph” as a feature, the Seagull ST2557 movement does not have chronograph capability — there are no stopwatch pushers or elapsed-time sub-dials. Its functions are GMT (central 24-hour hand), small seconds, and date only.
Is the GMT function a true GMT, or just a second time zone sub-dial? It’s a true GMT — a central hand makes one full rotation every 24 hours, independently trackable from the main hour and minute hands, allowing simultaneous tracking of a second time zone.
Is this a certified dive watch? Not based on available specifications. It carries a robust 100m water resistance rating, which supports swimming and showering, but a certified dive watch requires additional ISO 6425 certification (shock resistance, magnetic resistance, timing bezel function) that isn’t documented for this specific model. Treat it as a strong everyday water-resistant watch rather than a dedicated dive instrument.
Does the watch need a battery? No — the ST2557 is a genuine automatic movement, self-winding through wrist motion, with manual winding available via the crown if needed.
What size is the watch? 45mm diameter, 17.5mm thick — a large, substantial case. Confirm this fits your wrist preference before ordering.
Is the crystal genuine sapphire? Yes — confirmed sapphire crystal, Mohs 9 hardness.
Shipping & Delivery
SHIPPING
We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.
Do you ship worldwide?
Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.
What about customs?
We are not responsible for any custom fees once the items have been shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.
How long does shipping take?
Shipping time varies by location. These are our estimates:| Location | *Estimated Shipping Time |
|---|---|
| United States | 5-20 Business days |
| Canada, Europe | 5-20 Business days |
| Australia, New Zealand | 5-20 Business days |
| Central & South America | 5-25 Business days |
| Asia | 5-20 Business days |
| Africa | 5-25 Business days |
Do you provide tracking information?
Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.
My tracking says “no information available at the moment”.
For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.
Will my items be sent in one package?
For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.
If you have any other questions, please contact us and we will do our best to help you out.
RETURNS
Order cancellation
All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.
Refunds
Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:
- If you did not receive the product within the guaranteed time (45 days not including 1-3 day processing) you can request a refund or a reshipment.
- If you received the wrong item you can request a refund or a reshipment.
- If you do not want the product you’ve received you may request a refund but you must return the item at your expense and the item must be unused.
We do not issue the refund if:
- Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
- Your order did not arrive due to exceptional circumstances outside the control of jwlraddicts.com (i.e. not cleared by customs, delayed by a natural disaster).
- Other exceptional circumstances outside the control of jwlraddicts.com.
*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page
If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.
Exchanges
If for any reason you would like to exchange your product, perhaps for a different size in clothing, you must contact us first and we will guide you through the steps.
Please do not send your purchase back to us unless we authorise you to do so.
Refunds & Returns
Order cancellation
All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.
Refunds
Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:
- If you did not receive the product within the guaranteed time( 45 days not including 2-5 day processing) you can request a refund or a reshipment.
- If you received the wrong item you can request a refund or a reshipment.
- If you do not want the product you’ve received you may request a refund but you must return the item at your expense and the item must be unused.
We do not issue the refund if:
- Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
- Your order did not arrive due to exceptional circumstances outside the control of jwlraddicts.com (i.e. not cleared by customs, delayed by a natural disaster).
- Other exceptional circumstances outside the control of //jwlraddicts.com
*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page
If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.
Exchanges
If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.
Please do not send your purchase back to us unless we authorise you to do so.
Customer Reviews
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nice watch.
Great watch with excellent finish came with super fast dispatch and delivery thanks
Excellent service. I recommend the watch and the store.
Excellent
A really great watch! Uncomplicated process, fast delivery. Thank you very much! :-)
The product is exactly as advertised. This is a large watch (45 mm and the crown) and quite heavy. Despite its size, the window of the date is tiny and its usefulness is scarce on land and negligible in water.
Great watch! The color scheme is fantastic. The case is solid stainless steel with a nice brushed finish. Bezel is polished to a mirror finish, making the dial really stand out well. Case is 45.5mm wide & 44.5mm tall (53.7mm including the lugs). Watch is 19mm thick. Lug width is 24mm. It features a screw down display case back to show off the decorated movement. The dial has a great sunburst effect in the light. Hour numbers & markers are cleanly cut out, making this sandwich style dial look impressive. All of the hands & date window line up well. Watch crystal is sapphire & display back is mineral glass. The rubber strap is very flexible. I have a 7.5 inch wrist & i am using the middle hole on the strap. The movement is a seagull st2557 gmt. It has a unidirectional rotor for automatic winding. Watch winder setting should be ccw (650 tpd has been working for me). I am very happy with this purchase. Thank you for reading this review & i hope it helps someone
Nice looking watch
Chunky and very good.
Product according to the description. Received quickly.