The Steelflier SF733 is a 39mm VK63 mecaquartz sport watch — a sweeping chronograph seconds hand from a hybrid quartz-mechanical caliber, 6-hand dial layout with 24-hour display and small seconds, Swiss BGW9 luminous on hands and markers, fixed “Units Per Hour” tachymeter-style bezel, synthetic sapphire crystal, screw-lock 7mm crown, screw-in solid caseback, 316L stainless steel case at 15.5mm and 45.5mm lug-to-lug, 62g without strap. Four variants (SF733-KN, SF733-HP, SF733-ZP, SF733-SS) with leather, nylon and stainless steel bracelet options.

Key Specifications

Variants — Four Configurations

SF733-KN: Khaki nylon strap — field and outdoor character.

SF733-HP: Black leather with white contrast stitching — the most sport-casual.

SF733-ZP: Brown leather — vintage-sport character.

SF733-SS: Stainless steel bracelet — the heaviest (160g total) and most formally structured.

VK63 Mecaquartz — “Mute Movement”

The VK63 is Seiko’s mecaquartz hybrid — a quartz oscillator driving a mechanical gear train that produces a smooth, continuously sweeping seconds hand rather than the discrete ticking steps of standard quartz. This is what “mute movement” refers to in the listing — the VK63 runs silently without the audible tick of a standard quartz caliber.

The practical advantages: quartz accuracy (approximately ±15 seconds per month) combined with the visual character of a mechanical sweep. The battery (SR936SW) is replaceable at any watch retailer.

The SF733’s 6-hand layout from the VK63:

Central hands: Hour, minute and sweeping chronograph seconds. Small seconds sub-dial: Running seconds — confirms the movement is operating continuously. 24-hour sub-dial: Shows the current hour in 24-hour format for AM/PM reference. Third register: Additional timing or display function — confirm from the product images which register this is.

Fixed Tachymeter Bezel

The bezel is fixed — it does not rotate. The “Units Per Hour” engraved scale and numbers are a tachymeter reference for speed calculation but without a rotating element the bezel functions as a static decorative feature. The tachymeter scale creates the visual language of a racing chronograph watch without a functional timing bezel.

BGW9 Lume

Same BGW9 as the SF752 — Swiss Super-LumiNova producing a blue-white afterglow rather than C3’s green. On the SF733’s black dial the BGW9 creates a blue-green lume visible in the low-light photography. The screw-lock crown and 200m rating mean the watch maintains seal integrity in water despite the quartz movement — the VK63’s battery chamber is sealed against the caseback.

15.5mm at 39mm — Thick Profile

At 15.5mm the SF733 is thicker than any equivalent 39mm quartz watch in the range — most quartz sport watches at this diameter are 9–12mm. The 15.5mm height reflects the deep case construction required for 200m water resistance and the thick 3.8mm sapphire crystal. The case proportions are unconventional — a small diameter with a tall profile — creating a specific character closer to a tool watch than a standard sport quartz.

Steelflier SF733 vs SF783 — Quartz vs Automatic

Both are Steelflier 200m divers at similar price points:

Choose SF733 for the smaller 39mm case, VK63 sweeping seconds, BGW9 lume and no winding requirement. Choose SF783 for the ceramic rotating bezel, automatic movement and the larger 41mm format.

Who Is the Steelflier SF733 For?

The SF733 is built for:

• VK63 mecaquartz buyers who want the sweeping seconds on a 200m rated sport watch
• 39mm compact case buyers who want the smallest Steelflier in the range
• BGW9 lume buyers who want the blue-white glow on a quartz sport watch
• Khaki nylon or brown leather buyers who want the specific strap aesthetics on a Steelflier

How It Compares

vs. Steelflier SF783 NH35 — See comparison table above. SF733 is quartz mecaquartz at 39mm; SF783 is NH35 automatic at 41mm with ceramic bezel.

vs. Farasute NL-007VK64 Chrono — Farasute uses VK64 (sibling to VK63) at 38mm with guilloché dress dial on leather. SF733 uses VK63 at 39mm with tachymeter sport dial and 200m. Same mecaquartz family — different character and water resistance.

vs. Corgeut 9002 VK63 — Corgeut uses VK63 at 40mm with sapphire crystal and tachymeter. SF733 uses VK63 at 39mm with confirmed 200m. Choose SF733 for the confirmed water resistance; choose Corgeut for the wider colour variant range.

More from Jewelry Addicts

• Steelflier SF783 NH35 41mm — automatic Steelflier diver
• Steelflier SF752 NH35 45mm — larger automatic Steelflier diver
• Steelflier SF790 GMT — Steelflier GMT alternative
• Farasute NL-007VK64 — VK64 dress mecaquartz alternative
• Best Automatic Watches Under $200 — full roundup

SF733-SS

With stainless steel strap

SF733-KN

With nylon strap

SF733-HP

With leather strap

SF733-ZP

With leather strap

Package specification:

-Quartz watch
-Waterproof watch box
-User manual
-Hang tag
-Warranty card
-Steel belt adjuster (choose steel belt to get)

Please note before purchase:

> Most of the product pictures of our store are taken in kind. Glow-in-the-dark pictures are taken after storing light for a long time. Shooting Angle, time, light and other factors may lead to errors between the real object and the picture.All the pictures are for reference only, please refer to the actual object!

> Due to different production batches and measurement methods, the size is only for reference, the specific size please refer to the actual!

> After the payment is completed, we will arrange to send the package as soon as possible according to the order.

> Shipping time depends on different shipping methods and distances, if you have not received your package for more than 30 days, please contact us.

> Please contact us if you have any problem with the watch, we will reply you as soon as possible and try our best to solve it for you.

> After receiving the package, please confirm whether it is consistent with the purchased product and complete before use. So as not to affect the use and after-sales service.

> Please do not arbitrarily disassembled watch! Disassembling the watch by non-professionals may affect the normal use of the watch, waterproof function and after-sales service.

> For return or exchange, please send all items (including purchased products, accessories, internal and external packaging, gifts, etc.) back together.

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