Seiko Cal. 4591 - 630

The 4591-630 is a sought-after Automatic piece from Seiko's golden era. Powered by the 4591 caliber with 20j jewels beating at 36,000 bph, it delivers a 67 hours power reserve. [seikata-wm-f5837a8de2e4]

Also known as: Monster, Tuna

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

12.0mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

Black

Jewels

20j

Frequency

36,000 bph

Power Reserve

67 hours

Year

1993

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