Seiko Cal. 6637 - 239

The Seiko 6637-239 represents an important milestone in Seiko's 1965 lineup. Powered by the 6637 caliber with 20j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-a6b97c8b1a85]

Also known as: Bullhead

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

46mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Cream

Jewels

20j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1965

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