Seiko Cal. 6131 - 660

The 6131-660 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6131 caliber with 33j jewels beating at 36,000 bph, it delivers a 49 hours power reserve. [seikata-wm-6a4408d7cb67]

Also known as: Monster

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

12.6mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Champagne

Jewels

33j

Frequency

36,000 bph

Power Reserve

49 hours

Year

1980

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