Seiko Cal. 4487 - 220

This Hand-Winding model from 1967 features a 41mm PVD Black case. Powered by the 4487 caliber with 24j jewels beating at 21,600 bph, it delivers a 50 hours power reserve. [seikata-wm-0641eb53d7d3]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

41mm

Case Thickness

14.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

White

Jewels

24j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1967

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