Seiko Cal. 0770 - 640

The Seiko 0770-640 represents an important milestone in Seiko's 1991 lineup. Powered by the 0770 caliber with 30j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-fc03aa95286a]

Also known as: Bullhead

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

44mm

Case Thickness

9.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

170m

Dial Color

Silver

Jewels

30j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1991

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