Seiko Cal. 3881 - 731

The Seiko 3881-731 represents an important milestone in Seiko's 1976 lineup. Powered by the 3881 caliber with 24j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-2ad4eddadda4]

Also known as: Panda, Bullhead

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.4mm

Lug Width

19mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

24j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1976

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