Seiko Cal. 4531 - 648

The 4531-648 is a sought-after Spring Drive piece from Seiko's golden era. It features a Black dial protected by a Hardlex crystal and offers 30m of water resistance. [seikata-wm-5e1f9d5bc13e]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

13.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

30m

Dial Color

Black

Jewels

24j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1999

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