Seiko Cal. 6171 - 631

The 6171-631 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6171 caliber with 20j jewels beating at 36,000 bph, it delivers a 66 hours power reserve. [seikata-wm-e17630ea5aeb]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

12.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Silver

Jewels

20j

Frequency

36,000 bph

Power Reserve

66 hours

Year

1970

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