Seiko Cal. 4550 - 660

The Seiko 4550-660 represents an important milestone in Seiko's 1978 lineup. Powered by the 4550 caliber with 23j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-dcda9845caee]

Also known as: UFO, Bellmatic

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

13.2mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

160m

Dial Color

Navy

Jewels

23j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1978

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