Seiko Cal. 6637 - 232

The Seiko 6637-232 represents an important milestone in Seiko's 1978 lineup. Powered by the 6637 caliber with 18j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-59c4c6c09f12]

Also known as: Goldfeather, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

160m

Dial Color

Cream

Jewels

18j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1978

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