Seiko Cal. 7138 - 723

The Seiko 7138-723 represents an important milestone in Seiko's 1977 lineup. Powered by the 7138 caliber with 27j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-e69a9c1692ef]

Also known as: Monster, Bellmatic

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

43mm

Case Thickness

8.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

40m

Dial Color

Champagne

Jewels

27j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1977

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