Seiko Cal. 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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