Seiko Cal. 7138 - 764

The 7138-764 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 7138 caliber with 19j jewels beating at 36,000 bph, it delivers a 47 hours power reserve. [seikata-wm-d415b3fab989]

Also known as: Sportsmatic, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

36mm

Case Thickness

13.6mm

Lug Width

22mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1972

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