Seiko Cal. 6643 - 621

Seiko 6643-621

This Automatic model from 1971 features a 46mm Hardlex-Coated Steel case. Powered by the 6643 caliber with 31j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-0d81dc6a36b4]

Also known as: Bellmatic, Baby Tuna

Specifications

Movement
Automatic
Case Material
Hardlex-Coated Steel
Case Width
46mm
Case Thickness
12.2mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
130m
Dial Color
Navy
Jewels
31j
Frequency
28,800 bph
Power Reserve
42 hours
Year
1971

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