Seiko Cal. 6668 - 731

The 6668-731 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6668 caliber with 33j jewels beating at 21,600 bph, it delivers a 60 hours power reserve. [seikata-wm-bcfa7d63c431]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

41mm

Case Thickness

11.4mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

150m

Dial Color

White

Jewels

33j

Frequency

21,600 bph

Power Reserve

60 hours

Year

1972

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