Sugess S365 Mechanical Chronograph Watch — Seagull ST1901, 40mm, Swanneck Option

Sugess S365 Mechanical Chronograph Watch — Seagull ST1901, 40mm, Swanneck Option

The Sugess S365 is a 40mm hand-wound mechanical chronograph powered by the Seagull ST1901 — a column-wheel chronograph movement available in standard or swanneck regulator configuration. Orange central chronograph seconds hand, dual sub-dials (running seconds left, 30-minute counter right), no numerals on the dial, exhibition caseback revealing decorated movement bridges and heat-blued screws, perforated rally leather strap and 50m water resistance.

Available in four configurations: turquoise dial in standard and swanneck versions, navy blue dial in standard and swanneck versions.

Key Specifications

Variants — Four Configurations

Turquoise / standard: A bright turquoise dial with the standard ST1901 regulator. The turquoise is the most vibrant and attention-generating of the two dial colours — a bold choice consistent with the racing chronograph’s visual language.

Turquoise / swanneck: The same turquoise dial with the swanneck regulator upgrade on the movement. The swanneck is visible through the exhibition caseback as an additional decorative and functional detail.

Navy blue / standard: A deep navy or dark blue dial with standard regulator. The navy is more restrained than the turquoise — appropriate for buyers who want the racing chronograph aesthetic in a more conservative colour.

Navy blue / swanneck: Navy dial with swanneck regulator. The swanneck upgrade is most visible against the navy dial’s darker subdial tones through the caseback.

Seagull ST1901 — Column-Wheel Chronograph

The Seagull ST1901 is a hand-wound mechanical column-wheel chronograph movement with a documented lineage from the Swiss Venus 175 caliber — a mid-20th century column-wheel chronograph architecture that powered several respected Swiss watches of its era. The Seagull movement retains the fundamental architecture of this design.

Column-wheel: The chronograph mechanism uses a column wheel to control the start/stop and reset functions — the same architecture associated with high-end Swiss chronographs for its more precise and tactile pusher engagement. The column wheel is visible through the exhibition caseback alongside the gear train.

Hand-winding only: No automatic rotor — the watch requires daily crown winding. The absence of a rotor enables the movement to be presented cleanly from the rear and contributes to the 69g total weight.

Chronograph operation:

• Top pusher (2 o’clock): start/stop the orange central chronograph seconds hand
• Bottom pusher (4 o’clock): reset the chronograph to zero (when stopped)

Running seconds: the left sub-dial shows continuous seconds independent of the chronograph — confirming the movement is running at all times.

30-minute counter: the right sub-dial accumulates chronograph minutes.

Swanneck Regulator — What It Does

The standard movement uses a conventional index regulator to adjust beat rate and timing accuracy. The swanneck regulator replaces this with a fine spring blade shaped like a swan’s neck that presses against the regulator pin — the curved blade provides more controlled, stable pressure than a conventional spring, allowing finer and more repeatable accuracy adjustment.

The practical effect is improved positional accuracy stability — once set, the swanneck regulator is less likely to drift from the adjusted position than a conventional regulator under normal wear vibration. It is also a visible decorative element: the swanneck blade’s distinctive curved profile is immediately identifiable through the exhibition caseback and is associated with higher-grade movement finishing.

For buyers who want the best expression of the ST1901, the swanneck variant is the correct choice. For buyers where the movement’s caseback display is less important, the standard variant provides the same chronograph function.

Orange Chronograph Hand

The orange central chronograph seconds hand is the primary design accent — a single colour element on an otherwise restrained dial. In racing chronograph design, the contrasting seconds hand is a functional specification (maximum visibility at speed for lap timing) that became a design signature. The orange hand against either turquoise or navy blue creates clear visual separation between the chronograph sweep and the subdial information below it.

Exhibition Caseback

The screw-in sapphire caseback presents the ST1901 architecture from the rear: golden-finished movement bridges, polished steel wheels, heat-blued screws and the column wheel. The blued screws result from controlled heat treatment applied during finishing — the blue oxide layer both protects the steel and creates the characteristic blue colour associated with higher-grade movement finishing. On the swanneck variants the swan’s neck spring is visible alongside these elements.

Perforated Rally Leather Strap

The perforated cowhide rally strap references motorsport watch straps from the 1960s and 1970s — the perforations reduce weight and improve ventilation during active wear. Contrast stitching adds visual definition consistent with the racing aesthetic. The 20mm standard width is compatible with aftermarket alternatives.

At 200mm total strap length this is shorter than the standard 220mm — buyers with wrists above approximately 18.5cm may need a longer strap.

Who Is the Sugess S365 For?

The S365 is built for:

• Mechanical chronograph enthusiasts who want the ST1901 column-wheel architecture with documented vintage lineage
• Swanneck regulator buyers who want the visible fine-adjustment spring through the caseback
• Racing and pilot watch aesthetic buyers who want a hand-wound chronograph with orange seconds hand and rally strap
• Buyers who want to see the movement operating from the rear — the golden bridges and blued screws create a compelling caseback display

This is not the correct choice for buyers who want automatic winding, deeper water resistance or quartz accuracy.

How It Compares

vs. Sugess S423 Chrono Heritage — The S423 is the other Sugess mechanical chronograph with 2,046 impressions. Compare both directly for movement specification and dial layout before publishing to differentiate clearly and avoid cannibalisation.

vs. Sugess S457 Panda Chrono — The S457 is the panda-dial Sugess chronograph. The S365 is the racing-dial alternative — turquoise and navy rather than panda/reverse-panda.

vs. Phylida SP-31 ST-19 Chrono — Both are 40mm hand-wound mechanical chronographs. The SP-31 uses the ST-19 column-wheel; the S365 uses the ST1901. Both have exhibition casebacks. Choose by dial preference (Phylida: black with green lume; Sugess S365: turquoise or navy with orange hand) and movement preference.

vs. Baltany S205034 VK64 Chrono — The Baltany uses VK64 meca-quartz for quartz accuracy with smooth sweep. The S365 is the fully mechanical hand-wound alternative for buyers who specifically want mechanical chronograph architecture.

More from Jewelry Addicts

• Sugess S423 Chrono Heritage — Sugess mechanical chronograph with most impressions
• Sugess S457 Panda Chrono — panda-dial Sugess chronograph
• Phylida SP-31 ST-19 Chrono — ST-19 column-wheel chronograph alternative
• Baltany S205034 VK64 — meca-quartz alternative
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