Seiko Cal. 4421 - 231

This Hand-Winding model from 1978 features a 40mm Hardlex-Coated Steel case. Powered by the 4421 caliber with 17j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-c525ef6aa2e2]

Also known as: UFO, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

9.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

160m

Dial Color

Navy

Jewels

17j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1978

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