Seiko Cal. 0770 - 378

The Seiko 0770-378 represents an important milestone in Seiko's 1986 lineup. Powered by the 0770 caliber with 17j jewels beating at 28,800 bph, it delivers a 52 hours power reserve. [seikata-wm-e23bb6340fc4]

Also known as: Tuna, Sea Horse

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.7mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Navy

Jewels

17j

Frequency

28,800 bph

Power Reserve

52 hours

Year

1986

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