Seiko Cal. 6646 - 563

The Seiko 6646-563 represents an important milestone in Seiko's 1974 lineup. Powered by the 6646 caliber with 18j jewels beating at 36,000 bph, it delivers a 42 hours power reserve. [seikata-wm-5f7ee2144eff]

Also known as: Tuna, Sea Horse

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

39mm

Case Thickness

11.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Silver

Jewels

18j

Frequency

36,000 bph

Power Reserve

42 hours

Year

1974

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