Seiko Cal. 5640 - 683

The Seiko 5640-683 represents an important milestone in Seiko's 1977 lineup. Powered by the 5640 caliber with 29j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-dba8cc0f280e]

Also known as: Sea Horse

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

13.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Silver

Jewels

29j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1977

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