Sea-Gull / Seagull ST2557 / TY2557

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13 1/2”’ | Automatic | Swiss Lever | Small Seconds at 9 H | Date at 3 H | 24 H Indication from Center |

Remarks:

  • Automatic with unidirectional winding
  • Small seconds with hacking
  • Date at 3 H with quick adjustment via middle crown position
  • Perlage decoration
  • Ball-bearing rotor
  • According to Watch-Wiki, the ST25 has 23,400 bph. However, all the ST25 versions I have seen so far have always had 21,600 bph
  • Part of a very large ST25/TY25 movement family:
    • ST2501:
      Automatic, hour/minute in the center, small seconds at 9 H, visible balance at 6 H
    • ST2502:
      Automatic, hour/minute/seconds in the center, date hand at 3 H, day of the week indicator at 9 H, visible balance wheel at 6 H
    • ST2503:
      Automatic, hour/minute/seconds in the center, date hand at 3 H, day of the week indicator at 9 H, month + year at 12 H, visible balance wheel at 6 H
    • ST2504:
      Automatic, hour/minute/seconds in the center, retrograde date display at 9 1/2 H, retrograde day of the week display at 2 1/2 H, visible balance wheel at 6 H
    • ST2505:
      Automatic, hour/minute/seconds in the center, retrograde date display at 9 1/2 H, power reserve indicator at 2 1/2 H, visible balance at 6 H
    • ST2508:
      Automatic, minute in the center, hour at 12 H, small seconds at 6 H
    • ST2509:
      Automatic, hour/minute/seconds in the center, power reserve indicator at 12 H, visible balance at 6 H
    • ST2510:
      Automatic, hour/minute/seconds in the center, second time zone at 12 H, visible balance wheel at 6 H
    • ST2525:
      Automatic, hour/minute/seconds in the center, day of the week indicator at 3 H, month indicator at 9 H, large date at 12 H, visible balance wheel at 6 H
    • ST2526:
      Automatic, hour/minute in the center, small seconds at 6 H, big date at 12 H
    • ST2527:
      Automatic, hour/minute/seconds in the center, day of the week indicator at 8 H, month indicator at 4 H, big date at 12 H
    • ST2528:
      Automatic, hour/minute in the center, small seconds and moon phase at 6 H, big date at 12 H
    • ST2529:
      Automatic, hour/minute/seconds in the center, 24-hour display at 6 H, weekday indicator at 3 H, month display at 9 H, big date at 12 H
    • ST2530:
      Automatic, hour/minute in the center, small seconds at 9 H, date at 3 H, power reserve indicator at 5 H
    • ST2531:
      Automatic, hour/minute/seconds in the center, date at 1 1/2 H, power reserve indicator at 6 H, crown at 4 H
    • ST2532:
      Automatic, hour/minute in the center, small seconds at 9 H, date at 6 H, power reserve indicator at 3 H
    • ST2533:
      Automatic, hour/minute/24 h indicator in the center, small seconds at 9 H, date at 3 H, power reserve indicator at 6 H
    • ST2540:
      Automatic, hour/minute/seconds in the center, year/month/24 h/day of the week arranged in a row from 8 to 4 H, big date at 12 H
    • ST2542:
      Automatic, hour/minute in the center, small seconds at 6 H, power reserve indicator at 12 H
    • ST2545:
      Automatic, small seconds in the center, hour/minute at 3 H, second time zone at 9 H, retrograde date at 6 H, power reserve indicator at 12 H
    • ST2551:
      Automatic, hour/minute/seconds in the center, date at 3 H
    • ST2551-S:
      Manual winding, hour/minute/seconds in the center, date at 3 H
    • ST2552:
      Automatic, hour/minute/seconds in the center, 24-hour indicator at 6 H, date at 4 1/2 H, day of the week indicator at 9 H, month indicator at 3 H
    • ST2553:
      As ST2551, but diameter 37.2 instead of 30.4 mm
    • ST2555:
      Automatic, hour/minute in the center, small seconds at 9 H, date at 3 H
    • ST2557:
      Automatic, hour/minute and 24-hour indicator in the center, small seconds at 9 H, date at 3 H
    • ST2561:
      Automatic, hour/minute in the center, date at 3 H, power reserve indicator at 6 H
    • ST2563:
      Automatic, small seconds in the center, hour/minute at 3 H, second time zone at 9 H, large date at 6 H, power reserve indicator at 12 H
    • ST2571:
      Automatic, hour/minute/seconds in the center, day/night indicator and small hand date at 12 H, visible balance wheel at 6 H
    • ST2590:
      Automatic, hour/minute/seconds in the center, perpetual calendar (day of the week at 9 H, month at 6 H, day at 3 H, 4-year display at 4 1/2 H, moon phase at 12 H)

 

  • Listing ID: 2176
  • Manufacturer / Brand: Sea-Gull / Seagull
  • Caliber: ST2557 / TY2557
  • Size in French Lignes: 13 1/2''' (30.4 mm), Height 7.4 mm
  • Size range mm largest diameter: 22 - 31 mm
  • Shape: Round
  • Winding: Automatic
  • Hands Setting: Crown
  • Seconds Hand: Small seconds
  • Escapement: Lever (Swiss, English, Glashütte)
  • Date, Day, Month...: Date
  • Other Functions: 24h Indicator
  • Jewels: 30
  • Setting Lever Screw/Pin Position: Right
  • Balance Position: Left (240 - 360°)
  • Shock Protection: Similar to Incabloc
  • Beats per hour: 21,600
  • Balance Type: Glucydur
  • Power Reserve: Unknown
  • Production Period: Probably starting before 2013
  • Identification: Listed in the Sea-Gull catalog 2013
  • External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-41#post-5319053
  • Country: China
  • Contributor ©: Uhrforum.de member Badener (Andreas Kelz)

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