Seagull Caliber St1902

Seagull Caliber ST1902

Seagull Caliber St1902

ManufacturerSeagull
Caliber NumberST1902, ST-1902, ST19, 1902
Based On
Venus 175
Movement Type
Mechanical chronograph, manual-wind
Lignes
13.75”’
Diameter
31.3mm
Height
6.25mm
Jewels
22
Beats per hour21,600 vph
Power Reserve
~42 hours (also seen reports of 51 hours)
Anti-Shock SystemIncabloc
Chronograph System
Column Wheel
Hand-Windable?Yes
Hacking Seconds?No
FunctionsCentral hours, central minutes, small seconds at 9:00, 30 min chronograph subdial at 3:00, 12 hour subdial at 6:00
Country of ManufactureChina
Known Models
Invicta 5105 (Add your watch to the comments below…)

The Sea-Gull caliber ST1902 is a mechanical hand-wound chronograph movement. This caliber is known to be based off of the Venus caliber 175. At one point a legend was circulating around the internet claiming that this series of movements is not only based on Venus calibers, but also manufactured on the same machines. If anyone has actual proof of this claim, please share in the comments below.

6:00 Subdial:

This movement is essentially a 2 subdial chronograph. The 6:00 subdial on the caliber ST1902 is often simply listed as a 12 hour subdial, causing confusion about the functionality. This is not a 12 hour totalizer subdial for the chronograph complication. It is a 12 hour hand that matches the main central hour hand.

Is ST1902 the same as ST19?

You may see the caliber number for this movement shortened to just ST19. This is accurate as the base caliber number, but it is not accurate when talking specifically about the ST1902. With ST19XX, the last two digits indicate different versions or complications added to the base ST19 (ST1901).

ST1902 VS TY2902:

As is common with watch calibers of Chinese origin, there is confusion with the caliber number system. The caliber ST1902 is the same as TY1902.

Replacement Prices:

At the time of this post, replacement prices for the Seagull caliber ST1902 were found online for around $110.00 USD.

Additional Image Gallery:

Seagull Caliber St1902 Mechanical 10 Seagull Caliber St1902 Mechanical

Additional Resources:


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Chuck
Chuck
1 year ago

I had a watch with this and I got rid of it. It looks nice on the backside but there are better variations of the ST19 IMHO. I never understand this movement and the hand at 6:00? It doesnt do anything, it doesnt even tell the 24 hour time or a second time. Is it just a decoration?

Gerald Bean
Gerald Bean
1 year ago
Reply to  Chuck

Chinese movements are known for having extra functions that have no purpose. Swiss would never put a hand that does nothing.

Hans
Hans
1 year ago
Reply to  Gerald Bean

No? How about Longines, using a closed date window on its retrograde military watch as many other Watchmakers do for some models. Nothing wrong with that idea. It does creates a ghost position for the Crown, yes. Perhaps we should skip the idea that Chinese craftmanship is …crap?

HoustonReal
HoustonReal
4 months ago
Reply to  Gerald Bean

The Venus 17x family had several variants, and I believe Sea-Gull just updated and copied the existing variants.

Charles
Charles
1 year ago

Beautiful movement.

Ed
Ed
1 year ago

Beautiful movement

GARY
GARY
1 year ago

Would this movement fit in a speed master case.

Gary
Gary
11 months ago

Can you fit a st1902 into a copy speedmaster ? And where can you buy the movement ring

Mark L.
Mark L.
11 months ago
Reply to  Gary

Anything is possible but the subdials aren’t all real chronograph subdials. Just make a cool watch why copy one?

Gary
Gary
10 months ago
Reply to  Mark L.

My watch is a replica speedmaster automatic and the dials do nothing. That is why i would like to fit a st1902 movement because its hand wind and the stop watch will work.

trackback
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8 months ago

[…] día de hoy, el calibre cronográfico ST19 resulta uno de los más interesantes de todo el mercado, tanto por sus aspectos técnicos como por […]

Geoff
Geoff
7 months ago

Definitely a BM, a beautiful movement!

Sam
Sam
6 months ago

Do you know what the lift angle is for the ST19?

Brian Centeno
Brian Centeno
6 months ago
Reply to  Sam

my question too

Jean du Moulin
Jean du Moulin
3 months ago
Reply to  Brian Centeno

About 54 to 55 degree angle, Brian.

Jean du Moulin
Jean du Moulin
3 months ago
Reply to  Sam

Hi Sam, about 54 to 55 degree angle.

Ian Watson
Ian Watson
5 months ago

I was wondering, seeing as this is the Venus 175 in everything but name, I have a NOS Sekonda 3017 dial and wondered if the dial would fit this as the dial is fitment for a Venus 150 aka the Strela. Anyone know?

Ian Watson
Ian Watson
3 months ago

I got my first true mechanical chronograph, an Alpha 1993 Daytona “panda” and wow it does not disappoint, esp with the display caseback and I am just sitting here watching all the little extra mechanisms do their thing. On mine the 6 subdial is a true 24hr clock, a bit pointless on any watch really as all you have to do is add or subtract 12 hours and spending time in the army its how… Read more »

stephane
stephane
3 months ago

Does anyone know where to find some compatible “balance wheels” or “balance wheel assemblies” for such ST19 ?

stephane
stephane
3 months ago
Reply to  Caliber Corner

Thank you for your answer … i was wondering if some ST16 / ST25 balance wheels (not the full assembly, but the wheel and spring) could be compatible, since i suspect the same origin for some of them (from pictures) + the fact that seagull has an incabloc system that was not proposed on the venus 175 : the reedition may have taken parts from other movements that are standalone and not copies from others… Read more »

Jean du Moulin
Jean du Moulin
3 months ago
Reply to  stephane

Esslinger might have some Seagull parts actually. Even the Seagull factories themselves might sell you the part(s). Sometimes even as a courtesy to their clientèle.

Jean du Moulin
Jean du Moulin
3 months ago
Reply to  Jean du Moulin

With ‘sometimes even as a courtesy to their clientèle’, I meant saying that sometimes they give it even for free as a courtesy to their clients/consumers.

Stephane
Stephane
3 months ago
Reply to  Jean du Moulin

Dear Jean, unless you may have a contact (?), i already tried by email and the seagull factory contacts i have from their website did not sell balance parts even in quantities (which is a common problem). CousinUK has some winding stems only. I also buy broken watches/movements to have some parts, but now i’m with a -1 balance (and a -1 click spring, which is more easily fixable if i take time to manualy… Read more »

trackback
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3 months ago

[…] aside, let’s take a closer look at this watch. Based on the Seagull ST19 manual wind bi-compax movement, the watch has pushers to control elapsed seconds and minutes. A […]

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