Longines 631-1143, Oscillating weight

• LONGINES original part, NOS in factory packaging.

• Fits cal: 631, 633, 636

Data: Longines cal: 631.1 (ETA 2824)

• 25 jewels, automatic wind, hour & minute.
• Size: 11.5''' 25.60 mm.
• H: = 4.60 mm.
• N: = 28.800 A/h.
• Power reserve: 40 h.
• Mainspring:

Versions: Suffix: 1 = 25 jewels, Suffix 2: = 17 jewels.

• 631: Base cal: ETA 2824
• 633: Base cal: ETA 2824, date, sweep second.
• 636: Base cal: ETA 2836, day, date, sweep second.