Seiko Cal. 5646 - 957

The Seiko 5646-957 represents an important milestone in Seiko's 1970 lineup. Powered by the 5646 caliber with 32j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-36871e0755e6]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

46mm

Case Thickness

13.6mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

Black

Jewels

32j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1970

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