Seiko Cal. 6637 - 867

This Spring Drive model from 1991 features a 36mm PVD Black case. Powered by the 6637 caliber with 24j jewels beating at 28,800 bph, it delivers a 45 hours power reserve. [seikata-wm-0aaa62f33679]

Also known as: Tuna, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Blue Sunburst

Jewels

24j

Frequency

28,800 bph

Power Reserve

45 hours

Year

1991

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