Seiko Cal. 5644 - 536

The Seiko 5644-536 represents an important milestone in Seiko's 1991 lineup. It features a Green dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-c5727e3c1bea]

Also known as: Golden Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

13.2mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

Green

Jewels

33j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1991

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