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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