Seiko Cal. 6331 - 710

The 6331-710 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6331 caliber with 28j jewels beating at 21,600 bph, it delivers a 59 hours power reserve. [seikata-wm-334b8a87df5c]

Also known as: Bullhead, Rally

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

42mm

Case Thickness

10.9mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

130m

Dial Color

Green

Jewels

28j

Frequency

21,600 bph

Power Reserve

59 hours

Year

1971

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