Seiko Cal. 6634 - 738

The 6634-738 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6634 caliber with 36j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-2da07bcc90d0]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

44mm

Case Thickness

14.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

100m

Dial Color

Green

Jewels

36j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1968

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