Seiko Cal. 6641 - 764

Released in 1970, the Cal. 6641 with design code 764 was part of Seiko's domestic market collection. The Fixed bezel and 46mm case give it a distinctive presence on the wrist. [seikata-wm-417ef7bf624b]

Also known as: UFO

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

13.7mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

180m

Dial Color

Black

Jewels

35j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1970

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