Seiko Cal. 4550 - 140

This Hand-Winding model from 1978 features a 41mm PVD Black case. Powered by the 4550 caliber with 29j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-4297f628b496]

Also known as: Sumo, Helmet

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

8.0mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

140m

Dial Color

Black

Jewels

29j

Frequency

21,600 bph

Power Reserve

37 hours

Year

1978

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