Seiko Cal. 6637 - 316

The Seiko 6637-316 represents an important milestone in Seiko's 1967 lineup. Powered by the 6637 caliber with 31j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-bfc47fe96b5d]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.3mm

Lug Width

19mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Champagne

Jewels

31j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1967

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