Seiko Cal. 6645 - 390

This Spring Drive model from 1970 features a 38mm Stainless Steel case. With its 19mm lug width and 10.2mm profile, it sits comfortably on most wrists. [seikata-wm-e7e8c042de1b]

Also known as: Monster, Silverwave

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

10.2mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Silver

Jewels

29j

Frequency

36,000 bph

Power Reserve

62 hours

Year

1970

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