Seiko Cal. 4491 - 841

This Spring Drive model from 1985 features a 37mm Hardlex-Coated Steel case. Powered by the 4491 caliber with 36j jewels beating at 28,800 bph, it delivers a 64 hours power reserve. [seikata-wm-f5e6ef91dbc5]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

9.5mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Silver

Jewels

36j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1985

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