6 3/4 x 8”’ | Hand Wind | Swiss Lever | No Second |

Remarks:

• Seiko Diafix setting for the escape wheel on the bridge side

• Listing ID: 264
• Manufacturer / Brand: UTC Universal Time Corporation (Seiko subsidiary)
• Caliber: UT 28A = Seiko 21 D
• Size in French Lignes: 6 3/4 x 8'''
• Size range mm largest diameter: 0 - 22 mm
• Shape: Form
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: None
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 17
• Setting Lever Screw/Pin Position: Right
• Balance Position: Right (0 - 120°)
• Shock Protection: Seiko Diashock
• Beats per hour: 19,800
• Balance Type: Glucydur
• Power Reserve: Unknown
• Production Period: Unknown, probably around 1970
• Identification: Movement marked with UT 28A. Data sheet for Seiko 21 D available.
• External Link: https://uhrforum.de/threads/identifizierte-uhrwerke-die-weder-bei-ranfft-lorenz-noch-im-watch-wiki-zu-finden-sind.86322/page-60#post-8462414
• Country: Japan
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)