Seiko Cal. 6640 - 750

This Quartz model from 1975 features a 37mm Stainless Steel case. Powered by the 6640 caliber with 32j jewels beating at 36,000 bph, it delivers a 65 hours power reserve. [seikata-wm-3437d711a07d]

Also known as: Samurai, Golden Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

11.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

80m

Dial Color

Green

Jewels

32j

Frequency

36,000 bph

Power Reserve

65 hours

Year

1975

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