Seiko Cal. 5238 - 640

The Seiko 5238-640 represents an important milestone in Seiko's 1975 lineup. Powered by the 5238 caliber with 34j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-f62dc0b94c24]

Also known as: Sumo, Flighty

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

9.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

White

Jewels

34j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1975

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