Seiko Cal. 4591 - 637

The 4591-637 is a sought-after Hand-Winding piece from Seiko's golden era. The Inner Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-84e17ba94bc3]

Also known as: Golden Tuna, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

39mm

Case Thickness

14.5mm

Lug Width

18mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

150m

Dial Color

Burgundy

Jewels

22j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1987

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