Seiko Cal. 5640 - 138

Released in 1971, the Cal. 5640 with design code 138 was part of Seiko's domestic market collection. It features a Silver dial protected by a Hardlex crystal and offers 90m of water resistance. [seikata-wm-96ff448ca315]

Also known as: Panda, Sea Horse

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

11.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Silver

Jewels

28j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1971

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