Seiko Cal. 4431 - 973

The 4431-973 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4431 caliber with 17j jewels beating at 36,000 bph, it delivers a 44 hours power reserve. [seikata-wm-04eb50b18442]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.4mm

Lug Width

22mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

200m

Dial Color

White

Jewels

17j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1991

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