Seiko Cal. 4538 - 813

The Seiko 4538-813 represents an important milestone in Seiko's 1966 lineup. Powered by the 4538 caliber with 20j jewels beating at 21,600 bph, it delivers a 69 hours power reserve. [seikata-wm-140062b17d96]

Also known as: Bullhead

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Silver

Jewels

20j

Frequency

21,600 bph

Power Reserve

69 hours

Year

1966

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