Seiko Cal. 4518 - 550

This Hand-Winding model from 1972 features a 40mm Titanium case. Powered by the 4518 caliber with 23j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-cc0c8310aaf2]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

40mm

Case Thickness

15.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Black

Jewels

23j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1972

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