Seiko Cal. 6637 - 320

The 6637-320 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6637 caliber with 28j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-8c8090c82443]

Also known as: Samurai

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

15.3mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Green

Jewels

28j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1975

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