14”’ | Hand Wind | Swiss Lever | Small Seconds at 9 H | Chronograph |

Remarks:

• Chronograph cam-actuated: central chronograph seconds, 30 min counter at 3 H
• The ST1901 base movement is a licensed replica of the Venus 175 on original machines. Unlike the Venus 175, the ST1901 does not have 18,000 bph but 21,600 bph. The cover plate on the dial side is also not present on the Venus 175 (see pictures).
• The movement belongs to the ST19 movement family:
  • ST1901: 2 register, small seconds at 9, 30 min counter at 3
  • ST1902: 3 register, small seconds at 9, 30 min counter at 3, 12 h register at 6 that mirrors the time-keeping hour hand
  • ST1903: 3 register, small seconds at 9, 30 min counter at 3, 24 h register at 6 that is not affiliated with the chronograph function
  • ST1904: unused model number, possibly being reserved for an automatic winding or true 3 register chronograph version
  • ST1905: 2 register, small seconds at 9, 30 min counter at 3, decentral power reserve at 4:30
  • ST1906: 2 register, small seconds at 9, 30 min counter at 3, decentral power reserve at 6
  • ST1907: 2 register, small seconds at 9, 30 min counter at 3, central power reserve indicator
  • ST1908: 4 register, small seconds at 9, 30 min counter at 3, date at 12, real moon phase at
  • ST1940: 2 register, small seconds at 9, 30 min counter at 3, automatic
• ST19xx and TY29xx are different designations for the same movement

 

 

• Listing ID: 4831
• Manufacturer / Brand: Sea-Gull / Seagull
• Caliber: ST1901 / TY2901
• Size: 14'''
• Shape: Round
• Winding: Manual (Crown)
• Hand Setting: Crown
• Seconds Hand: Small seconds
• Escapement: Lever (Swiss, English, Glashütte)
• Date & Day: None
• Other Functions: Chronograph
• Jewels: 23
• Setting Lever Screw/Pin Position: Right
• Balance Position: Right (0 - 120°)
• Shock Protection: Similar to Incabloc
• Beats per hour: 21,600
• Balance Type: Glucydur?
• Power Reserve: Unknown
• Production Period: Unknown, from current production
• Identification: Website of the manufacturer Sea-Gull and information from the watch manufacturer.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-5#post-1517841
• Country: China
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)