Seiko Cal. 0770 - 861

The Seiko 0770-861 represents an important milestone in Seiko's 1968 lineup. Powered by the 0770 caliber with 25j jewels beating at 21,600 bph, it delivers a 66 hours power reserve. [seikata-wm-e8c8d1db8bea]

Also known as: Tuna

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

38mm

Case Thickness

12.0mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

Black

Jewels

25j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1968

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