Seiko Cal. 6643 - 763

The 6643-763 is a sought-after Solar piece from Seiko's golden era. It features a Blue Sunburst dial protected by a Sapphire crystal and offers 140m of water resistance. [seikata-wm-75fd385acc86]

Also known as: UFO, Rally

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

11.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

34j

Frequency

36,000 bph

Power Reserve

57 hours

Year

1973

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