Seiko Cal. 3855 - 977

The Seiko 3855-977 represents an important milestone in Seiko's 1967 lineup. Powered by the 3855 caliber with 17j jewels beating at 28,800 bph, it delivers a 39 hours power reserve. [seikata-wm-b172b619cb00]

Also known as: Sumo, Helmet

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

10.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

17j

Frequency

28,800 bph

Power Reserve

39 hours

Year

1967

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