Seiko Cal. 5640 - 536

Released in 1971, the Cal. 5640 with design code 536 was part of Seiko's domestic market collection. With its 22mm lug width and 14.4mm profile, it sits comfortably on most wrists. [seikata-wm-2baa33bc7694]

Also known as: Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

14.4mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Green

Jewels

35j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1971

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