Seiko Cal. 6631 - 612

This Spring Drive model from 1972 features a 42mm PVD Black case. Powered by the 6631 caliber with 33j jewels beating at 28,800 bph, it delivers a 69 hours power reserve. [seikata-wm-1d3714b58cc2]

Also known as: Arnie

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

15.8mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Champagne

Jewels

33j

Frequency

28,800 bph

Power Reserve

69 hours

Year

1972

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