Seiko Cal. 6637 - 101

The Seiko 6637-101 represents an important milestone in Seiko's 1969 lineup. With its 20mm lug width and 8.7mm profile, it sits comfortably on most wrists. [seikata-wm-5a923bcb22b2]

Also known as: Monster

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

43mm

Case Thickness

8.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Black

Jewels

26j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1969

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