Seiko Cal. 6639 - 778

This Hand-Winding model from 1966 features a 41mm Hardlex-Coated Steel case. It features a Silver dial protected by a Sapphire crystal and offers 40m of water resistance. [seikata-wm-73047c2d0b44]

Also known as: Sportsmatic, Arnie

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

12.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

40m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

42 hours

Year

1966

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