Seagull Tianjin Caliber St2500

Seagull Caliber ST25

Seagull Tianjin Caliber St2500

ManufacturerSeagull
Caliber NumberST25, ST2500
Type
Automatic
Lignes
13.5”’
Diameter
30.4mm
Height
7.4mm – 7.9mm
Jewels25-45
Beats per hour21,600 vph
Power Reserve~45-48 hours
Anti-Shock SystemIncabloc
Lift Angle
Needs confirmed
Hand-Windable?Yes
Hacking Seconds?Yes
FunctionsVarious (see chart below)
Country of ManufactureChina
Known Models
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The Seagull caliber ST25 is the base designation for a wide variety of ST25XX movements from Tianjin Seagull Watch Industry Group, Ltd (天津海鸥表业集团有限公司).

ST movements are said to be from the Tianjin Seagull factory, and TY movements are from the Seagull Hong Kong (HK) factory. Corresponding Tianjin calibers are TY25XX.

Below is a list of the ST25 calibers with jewel count and complications:

CaliberFeatures
2500 (ST2500, TY2500)
25 jewels, 7.4mm thick
Central seconds, open balance at 6:00
2501 (ST2501, TY2501)
25 jewels, 7.4mm thick
Small seconds at 9:00, open balance wheel at 6:00
2502 (ST2502, TY2502)
29 jewels, 7.4mm thick
Central seconds, date at 3:00, day at 9:00, open balance at 6:00
2503 (ST2503, TY2503)
29 jewels, 7.4mm thick
Central seconds, date subdial at 3:00, day at 9:00, year/month at 12:00, open balance at 6:00
2504 (ST2504, TY2504)
33 jewels, 7.4mm
Central seconds, retrograde date at 9:30, retrograde day at 2:30, open balance at 6:00
2505 (ST2505, TY2505)
38 jewels, 7.4mm thick
Central seconds, retrograde date at 9:30, power reserve at 2:30, open balance at 6:00
2508 (ST2508, TY2508)Central minutes, hours at 12:00, small seconds at 6:00
2509 (ST2509, TY2509)
34 jewels, 7.4mm thick
Central seconds, power reserve indicator at 12:00, open balance wheel at 6:00
2510 (ST2510, TY2510)
31 jewels, 7.3mm thick
Central seconds, 2nd time zone hr/min at 12:00, open balance at 6:00
2525 (ST2525, TY2525)
29 jewels, 7.9mm thick
Central seconds, double digit date at 12:00, month at 9:00, day at 3:00, open balance at 6:00
2526 (ST2526, TY2526)
29 jewels, 7.9mm thick
Double digit date at 12:00, small seconds at 6:00
2527 (ST2527, TY2527)
25 jewels, 7.9mm thick
Central seconds, double digit date at 12:00, month at 4:00, day at 8:00
2528 (ST2528, TY2528)
29 jewels, 7.9mm thick
Small seconds at 6:00, moonphase at 6:00, double digit date at 12:00
2529 (ST2529, TY2529)
29 jewels, 7.9mm thick
Central seconds, double digit date at 12:00, 24hr subdial at 6:00, day subdial at 3:00, month at 9:00
2530 (ST2530, TY2530)
33 jewels, 7.4mm thick
Small seconds at 9:00, date at 3:00, power reserve indicator at 5:00
2531 (ST2531, TY2531)
4:00 crown
Central seconds, date at 1:30, power reserve indicator at 6:00
2532 (ST2532, TY2532)
31 jewels, 7.4mm thick
Small seconds at 9:00, power reserve indicator at 3:00, date at 6:00
2533 (ST2533, TY2533)
31 jewels, 7.4mm
Central GMT hand, small seconds at 9:00, date at 3:00, power reserve indicator at 6:00
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2540 (ST2540, TY2540)Central seconds, double digit date at 12:00, year, month, day, 24hr time in a horizontal line of subdials from 4:00 to 8:00
2542 (ST2542, TY2542)
34 jewels, 7.4mm thick
Small seconds at 6:00, power reserve indicator at 12:00
2545 (ST2545, TY2545)
40 jewels
Central small seconds, 1st time zone hr/min at 9:00, 2nd time zone hr/min at 3:00, retrograde date at 6:00, power reserve indicator at 12:00
2551 (ST2551, TY2551)
25 jewels, 7.4mm thick
Central seconds, date at 3:00
2551-S (ST2551S, TY2551S)
Manual wind
Central seconds, date at 3:00
2553 (ST2553, TY2553)
25 jewels, 7.4mm thick
Central seconds, date at 3:00
2555 (ST2555, TY2555)
30 jewels, 7.4mm thick
Small seconds at 9:00, date at 3:00
2557 (ST2557, TY2557)
30 jewels, 7.4mm thick
Central GMT hand, small seconds at 9:00, date at 3:00
2590 (ST2590, TY2590)
Perpetual Calendar, 39 jewels
Central seconds, day at 9:00, month at 6:00, years at 4:30, moonphase at 12:00, perpetual calendar

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19 Comments
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Joe
Joe
3 years ago

Very nice st2505 movement.
Love this one…

IMG_20210113_234354379.jpg
IMG_20210113_232329605.jpg
Frederik de Haan
Frederik de Haan
3 years ago
Reply to  Joe

Well Joe, that’s a heck of a beautiful calibered watch.
It’s my favourite one too, this Seagull 2505 caliber.

alex
alex
2 years ago

ingersoll has a 37 jewel movement in it

Greg Bonaccorsi
Greg Bonaccorsi
2 years ago
Reply to  alex

The ingersoll Hawley is a 37 jewel movement based on st2505

Szabó Sándor
Szabó Sándor
2 years ago

I want to know what kind of automatic movement is in the pictures?
What is your name and number? Maybe seagull?

IMG_20200504_182651.jpg
IMG_20200504_182533.jpg
IMG_20200504_182555.jpg
alex
alex
2 years ago

I’ve this one, and it looks great, but anyone can tell me where to find hands that fit, can’t find the specifications of hands (diameter of holes etc…) thanks :p

Pablo
Pablo
5 months ago
Reply to  alex

I found them on Ali. Most probably you have found them by now too…

Tom
Tom
1 year ago

Does anyone knows what is the hour and minutes hands sizes ?

DAN
DAN
1 year ago
Reply to  Tom

GL finding out. With Seagull you’re SOL if you need technical info like that.

John
John
1 year ago

Ciga Design Z series uses the ST2553JK movement

Josep Maria Aguasca Ribot
Josep Maria Aguasca Ribot
1 year ago

I own a 2530 and I’m very satisfied with their consistency through the entire development of the mainspring, alongside with the isochronism and accuracy.

Shay
Shay
10 months ago

Any alternative to the 2555 movement? I’m searching to replace it in a watch, with a more reliable and documented one.

Ian Watson
Ian Watson
10 months ago

I am suspecting the Oskar Emil Orbit which is a regulateur tourbillion is based on this movement as the back view is identical. The Orbit has second hand attached to the rotating balance, a central minute hand and a sub dial hour hand at 12.

Numair Aidroos
Numair Aidroos
10 months ago

How accurate is this movement series? Mine keeps – 10 spd.

Hans Henssen
Hans Henssen
9 months ago
Reply to  Numair Aidroos

+/- 12 sec. / day, @Numair Aidroos

Numair Aidroos
Numair Aidroos
7 months ago
Reply to  Hans Henssen

Thank you.

Edoardo Fenini
Edoardo Fenini
7 months ago
Reply to  Hans Henssen

I’m sorry but from were do you recover such information (in terms of source/website)

Hans Henssen
Hans Henssen
9 months ago

The lift angle of Caliber 219a, 219 is 53 degrees. I’m sure, I read it thru. @CC

Hans Henssen
Hans Henssen
9 months ago
Reply to  Hans Henssen

Ingersoll Cal. 219, 219a = Seagull Cal. ST 25

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