Seiko Cal. 6639 - 760

Released in 1971, the Cal. 6639 with design code 760 was part of Seiko's domestic market collection. It features a White dial protected by a Sapphire crystal and offers 60m of water resistance. [seikata-wm-6eacbb418de1]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

42mm

Case Thickness

9.5mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

White

Jewels

21j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1971

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