Seiko Cal. 6637 - 522

This Spring Drive model from 1966 features a 35mm PVD Black case. It features a Green dial protected by a Mineral crystal and offers 60m of water resistance. [seikata-wm-1c3367dba540]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

35mm

Case Thickness

11.7mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Green

Jewels

22j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1966

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