Seiko Cal. 4591 - 636

The Seiko 4591-636 represents an important milestone in Seiko's 1978 lineup. Powered by the 4591 caliber with 26j jewels beating at 28,800 bph, it delivers a 68 hours power reserve. [seikata-wm-70d842b0e729]

Also known as: Monster, Tuna

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

46mm

Case Thickness

13.3mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

90m

Dial Color

Black

Jewels

26j

Frequency

28,800 bph

Power Reserve

68 hours

Year

1978

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