Seiko Cal. 6663 - 640

This Automatic model from 1986 features a 46mm Two-Tone case. Powered by the 6663 caliber with 27j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-30e1f484ae6c]

Also known as: Sumo, World Timer

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

46mm

Case Thickness

14.9mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

110m

Dial Color

Green

Jewels

27j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1986

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