Seiko Cal. 6637 - 621

The Seiko 6637-621 represents an important milestone in Seiko's 1967 lineup. Powered by the 6637 caliber with 26j jewels beating at 36,000 bph, it delivers a 62 hours power reserve. [seikata-wm-a84c1689ea97]

Also known as: Helmet

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

12.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

150m

Dial Color

Burgundy

Jewels

26j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1967

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