Seiko Cal. 7138 - 788

The 7138-788 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 7138 caliber with 33j jewels beating at 28,800 bph, it delivers a 66 hours power reserve. [seikata-wm-e2aa96d1436a]

Also known as: Bullhead, Silverwave

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

35mm

Case Thickness

9.5mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

Silver

Jewels

33j

Frequency

28,800 bph

Power Reserve

66 hours

Year

1991

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