Seiko Cal. 6637 - 412

The 6637-412 is a sought-after Spring Drive piece from Seiko's golden era. The Coin-Edge bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-12e00df846bc]

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

11.6mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Black

Jewels

33j

Frequency

36,000 bph

Power Reserve

53 hours

Year

1983

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