Seiko Cal. 0720 - 641

This Solar model from 1970 features a 40mm Hardlex-Coated Steel case. Powered by the 0720 caliber with 23j jewels beating at 21,600 bph, it delivers a 42 hours power reserve. [seikata-wm-572b0e5de2d8]

Also known as: Navigator, Baby Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

13.7mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

160m

Dial Color

Silver

Jewels

23j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1970

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