11 1/2”’ | Automatic | Swiss Lever | Small Seconds |

Remarks:

• Automatic with Magic Lever and bidirectional winding
• Small seconds without hacking
• The Sea-Gull ST17 caliber is a derivative of the ST16
  Differences:
  • Seconds hacking only on the ST16
  • In the ST17, the fourth wheel is located at 6 H in order to be able to realize a small second; in the ST16, the escape wheel is located there
• The ST1780 is part of a very large family of movements:
  • 1700: manual winding, central hour, central minute, small seconds at 6 H
  • 1701: Automatic, central hour, central minute, small seconds at 6 H
  • 1711: Automatic, hour display with small hand at H12 o’clock, central minute, small seconds
  • 1721: Automatic, jumping hour at 12 H, central minute, small seconds
  • 1731: Automatic, central hour, central minute, small seconds at 6 H, date
  • 1741: Automatic, central hour, central minute, small seconds at 6 H, large date
  • 1780: Automatic, central hour, central minute, small seconds at 6 H, date display with small hand, power reserve indicator

• Listing ID: 4330
• Manufacturer / Brand: Sea-Gull / Seagull
• Caliber: ST1701 / TY2706
• Size in French Lignes: 11 1/2'''
• 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...: None
• Jewels: 20
• Setting Lever Screw/Pin Position: Left
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Similar to Incabloc
• Beats per hour: 21,600
• Balance Type: Glucydur
• Power Reserve: 40+ hours
• Production Period: At least sincd 2013
• Country: China
• Identification: Listed in the Sea-Gull catalog 2013.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-12#post-2327852