Seiko Cal. 6637 - 627

The 6637-627 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6637 caliber with 17j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-d34be0e60072]

Also known as: Bullhead, Rally

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

39mm

Case Thickness

14.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

180m

Dial Color

White

Jewels

17j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1976

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