Seiko Cal. 3813 - 860

This Spring Drive model from 1971 features a 43mm Titanium case. Powered by the 3813 caliber with 28j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-94334471a48c]

Also known as: Monster, Tuna

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

9.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Blue Sunburst

Jewels

28j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1971

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