Seiko Cal. 6645 - 620

The Seiko 6645-620 represents an important milestone in Seiko's 1981 lineup. The Bidirectional bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-3fd75ceb8395]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

12.3mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Cream

Jewels

35j

Frequency

21,600 bph

Power Reserve

38 hours

Year

1981

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