42mm • 316L Stainless Steel • Seagull ST25 Automatic • Open-Heart Flywheel • Pointer Day and Date • Transparent Caseback

The Seagull D819.624 packs three watch complications into a single dial — and makes them all visible at once. The open-heart flywheel sits at 6 o’clock, exposing the spinning balance wheel through the dial face. A pointer day-of-week display occupies the left sub-register with Sunday highlighted in red. A pointer date register sits to the right. Blue-blued steel hands sweep across Roman numerals on a guilloché-textured white dial.

The movement driving all of this, the Seagull ST25, is a 29-jewel automatic caliber with a 45-hour power reserve — the longest in the current Seagull lineup reviewed here — running at 21,600 vph. It is visible from both the front through the flywheel aperture and from the rear through the transparent sapphire caseback, which shows the Seagull-engraved decorated rotor and movement bridge finishing.

Browse the full Seagull watches collection at Jewelry Addicts for all available models.

The Dial — Three Complications, One Coherent Layout

The D819.624 is more complex than most watches at this price, and the complexity is arranged so it reads cleanly rather than feeling crowded. Here is what is on the dial and where:

Open-heart flywheel at 6 o’clock. The balance wheel of the ST25 movement is exposed through a cutout in the dial at the lower center position. In operation, the balance wheel oscillates visibly at 21,600 vph — three full back-and-forth movements per second. The flywheel bridge is finished with blue screws at each end and a ruby jewel bearing at the center, creating a jewellery-quality detail that reads as intentional craftsmanship rather than gimmickry.

Pointer day-of-week register at 9 o’clock. A dedicated sub-dial with a blue hand pointing to the current day abbreviation around the ring: THU, WED, TUE running one way and FRI, SAT, SUN the other. Sunday is printed in red — a traditional horological convention for identifying the day of rest, carried forward from pocket watch design. This is a retrograde-style pointer complication rather than a date window.

Pointer date register at 3 o’clock. A second sub-dial with a blue hand pointing to the current date around a ring of numbers. Both registers use the same pointer hand design, creating visual consistency across the two calendar complications.

Roman numerals and guilloché dial. The main dial displays the hours in Roman numerals — I through XII — on a white guilloché-textured surface with a fine radial wave pattern. The texture adds depth without competing with the complications. The minute track runs around the inner bezel edge.

The blue-steel hands on the main dial are a specific choice — blued steel is a traditional watchmaking finishing technique applied through heat treatment that gives the hands their distinctive blue-black colour. Against the white dial they create maximum legibility and visual contrast.

The ST25 Movement — 29 Jewels and 45-Hour Power Reserve

The Seagull ST25 is one of Seagull’s more capable automatic calibers. The key specifications visible in the movement image:

45-hour power reserve — the longest in this Seagull range, giving over a day and a half of running time after the watch is taken off. For a watch not worn on weekends, this means it will still be running Monday morning after being removed Friday evening.

29 jewels — each jewel is a synthetic ruby bearing that reduces friction at a gear or pivot point. 29 jewels is a high jewel count for an automatic movement in this category, covering additional complication complications (day and date mechanisms) alongside the standard movement bearing points.

21,600 vph — the same standard frequency as the ST17 in the 6184. At this frequency, the seconds hand advances in 1/6-second increments — more visible step between ticks than higher-beat movements, but mechanically appropriate for a complication-equipped caliber of this construction.

Visible through both sides — the flywheel aperture in the dial shows the balance wheel in motion from the front. The transparent caseback (model D819.62 caseback inscription visible in the image) shows the decorated rotor and movement bridge from the rear. The caseback finishing includes the Sea-Gull logo engraved on the rotor and a diamond-guilloche pattern on the main plate.

The Transparent Caseback

The caseback image shows the full movement in detail. The rotor is engraved with the Sea-Gull logo and text, with a satin-brushed main plate beneath. The balance wheel and escapement are visible at the lower right of the movement. The caseback inscription reads: Stainless Steel, Sea-Gull, D819.62.

The caseback is secured with four screws — visible in the image as the four fixing points around the perimeter. This construction allows easy access for servicing while maintaining the water-resistant seal.

Full Specifications

The Case and Strap

At 42mm diameter and 13mm case thickness, the D819.624 is the largest and most substantial watch in the Seagull range at Jewelry Addicts. The extra case depth compared to the slim 6184 accommodates the ST25 movement with its three complications and the additional mechanism layers required for the day and date pointer systems.

The case finishing is fully polished — visible in the side-profile image showing the highly reflective flanks and the Seagull-engraved crown with S logo. Fully polished stainless steel is the appropriate choice for a formal business watch of this character, though it requires occasional attention to maintain the mirror finish.

The leather strap has a crocodile-texture pattern with handmade edge stitching — visible in the caseback image — that sits flush along the strap edge rather than sitting proud of the surface. The Sea-Gull branded pin buckle completes the formal presentation.

At 20mm strap width on a 42mm case with a 13mm profile, this watch sits as a clear statement piece on the wrist. It is not a slim daily wearer in the category of the 6184 — it is a full-presence business watch that reads as complex and considered from a distance.

How It Compares Within the Seagull Range at Jewelry Addicts

The D819.624 occupies a completely different position from the other Seagull watches in the range at Jewelry Addicts.

The Seagull 6184 is the slim formal specialist — 10mm thick, sub-seconds complication, four colour dial options, the opposite end of the Seagull dress watch spectrum from the D819.624.

The Seagull 819.17 Bauhaus is the minimalist option — clean white dial, slim indices, no complications, Bauhaus design language.

The Seagull M162 uses the ST25 movement in a different configuration with multifunction displays and an open-heart design.

The Seagull Pilot 819.33.6080H adds the ST2502 movement in a pilot instrument case for a completely different aesthetic register.

The D819.624 is the choice when you want maximum visual complexity — flywheel, day, date, Roman numerals, blued hands — in a classic round business watch case. Browse the complete Seagull watches range and men’s automatic watches for the full selection.

Who the D819.624 Is For

Business watch buyers who want visible mechanical complexity. The open-heart flywheel makes the ST25 movement an active part of the watch experience — it is not hidden behind a solid dial but displayed as the central decorative element at 6 o’clock. Day and date complications add daily practical utility.

Roman numeral and traditional aesthetic buyers. The combination of Roman numerals, blued steel hands, guilloché dial, and crocodile-texture leather places this watch firmly in the classical European business watch tradition. It reads as a statement of heritage rather than a modern sports piece.

ST25 movement enthusiasts. The 29-jewel, 45-hour power reserve Seagull caliber is visible from both front and back simultaneously — an unusual double-visibility feature that rewards buyers who chose the watch for its movement.

Buyers who want day and date together. Most watches at this price offer date only. The D819.624’s pointer day-of-week display alongside the date register is a practical complication combination that removes the need to check a phone for the day of the week.

For complementary accessories, see the men’s rings collection and the San Martin watches for automatic watches at different aesthetic registers.

FAQ

What is the open-heart flywheel? The open-heart flywheel is a dial aperture at 6 o’clock that exposes the ST25 movement’s balance wheel directly through the dial face. The balance wheel oscillates visibly in operation — three complete back-and-forth movements per second at 21,600 vph. It is a traditional watchmaking complication that makes the mechanical heart of the watch visible during wear.

What is the pointer day calendar? Rather than a window showing a date number, the pointer day complication uses a dedicated sub-dial with a hand pointing to the current day abbreviation around a ring. The hand advances once every 24 hours. Sunday is highlighted in red — a traditional horological convention. The pointer date register works on the same principle for the date.

What is the Seagull ST25 movement? The ST25 is a Seagull in-house automatic caliber with 29 jewels, a 45-hour power reserve, and a frequency of 21,600 vph. It is designed to accommodate multiple complications — in the D819.624 it drives the hour, minute, seconds, day-of-week pointer, and date pointer simultaneously. The movement is visible through both the front flywheel aperture and the rear transparent caseback.

How does the 45-hour power reserve work in practice? If you remove the watch Friday evening after work, the 45-hour reserve means the watch will still be running Sunday afternoon. For a daily business watch not worn on weekends, this is a practical advantage — the watch requires less frequent resetting to time on Monday mornings compared to movements with 38–42-hour reserves.

Is 5 bar water resistance enough for daily wear? Yes — 5 bar / 50m is appropriate for daily wear including rain and hand washing. Not recommended for swimming or immersion sports. The D819.624 is positioned as a business and formal watch where daily wear water exposure is the primary consideration.

Can I change the strap? Yes — standard 20mm spring bar attachment. Any 20mm leather strap fits without modification. The current black crocodile-texture strap is appropriate for business and formal contexts.

Where does it ship from? Available from United States and Germany — select your preferred origin at checkout for the fastest delivery to your region.