Seiko Cal. 0731 - 634

The 0731-634 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 0731 caliber with 23j jewels beating at 36,000 bph, it delivers a 38 hours power reserve. [seikata-wm-ebe938bc52e6]

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

42mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

170m

Dial Color

Blue Sunburst

Jewels

23j

Frequency

36,000 bph

Power Reserve

38 hours

Year

1977

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