Seiko Cal. 5640 - 126

Released in 1975, the Cal. 5640 with design code 126 was part of Seiko's domestic market collection. Powered by the 5640 caliber with 21j jewels beating at 36,000 bph, it delivers a 45 hours power reserve. [seikata-wm-3ceb5fd68810]

Also known as: Sea Horse

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

14.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

180m

Dial Color

White

Jewels

21j

Frequency

36,000 bph

Power Reserve

45 hours

Year

1975

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