Seiko Cal. 6391 - 185

This Solar model from 1976 features a 40mm PVD Black case. Powered by the 6391 caliber with 30j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-e0113c7d421e]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Solar

Case Material

PVD Black

Case Width

40mm

Case Thickness

13.5mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Silver

Jewels

30j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1976

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