Seiko Cal. 6645 - 503

The Seiko 6645-503 represents an important milestone in Seiko's 1972 lineup. Powered by the 6645 caliber with 33j jewels beating at 36,000 bph, it delivers a 70 hours power reserve. [seikata-wm-a5dd8778c096]

Also known as: Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

100m

Dial Color

Cream

Jewels

33j

Frequency

36,000 bph

Power Reserve

70 hours

Year

1972

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