12 1/4”’ | Hand Wind | Swiss Lever | Direct Sweeping Seconds |

Remarks:

• High-beat movement (36.000 bph)
• Seiko Diafix combined settings on escape wheel and third wheel (on bridge side and dial side)
• Micro-adjustor for regulation
• Movement family:
  • Seiko 560: base movement, 19/21 jewels, 18.000 bph, no micro-adjustor
  • Seiko 5740A: 23 jewels, 18.000 bph (from 1964 onwards)
  • Seiko 5740B: 23 jewels, 19.800 bph (from 1966 onwards)
  • Seiko 5740C: 23 jewels, 36.000 bph (from 1967 onwards)

• Listing ID: 11813
• Manufacturer / Brand: Seiko
• Caliber: 5740C
• Size in French Lignes: 12 1/4''' (27.6 mm), height 4.40 mm
• Size range mm largest diameter: 22 - 31 mm
• Shape: Round
• Winding: Manual (Crown)
• Hands Setting: Crown
• Seconds Hand: Sweeping seconds (central seconds)
• Escapement: Lever (Swiss, English, Glashütte)
• Date, Day, Month...: None
• Jewels: 23
• Setting Lever Screw/Pin Position: Right
• Balance Position: Bottom (120 - 240°)
• Shock Protection: Seiko Diashock
• Beats per hour: 36,000
• Balance Type: Glucydur
• Power Reserve: Unknown
• Production Period: 1967 - 1978
• Country: Japan
• Identification: Movement marked with Seiko 5740C. Original datasheet available.
• Contributor ©: Uhrforum.de member Badener (Andreas Kelz)