Seiko Cal. 6640 - 781

This Automatic model from 1970 features a 46mm Two-Tone case. Powered by the 6640 caliber with 21j jewels beating at 36,000 bph, it delivers a 58 hours power reserve. [seikata-wm-365bb8365213]

Also known as: Pogue, Crown

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

46mm

Case Thickness

8.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Black

Jewels

21j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1970

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