Seiko Cal. 6637 - 745

The 6637-745 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6637 caliber with 21j jewels beating at 36,000 bph, it delivers a 69 hours power reserve. [seikata-wm-ff03f0a2331c]

Also known as: Crown, Arnie

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

10.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

69 hours

Year

1998

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