Seiko Cal. 6643 - 836

The 6643-836 is a sought-after Solar piece from Seiko's golden era. It features a Black dial protected by a Mineral crystal and offers 70m of water resistance. [seikata-wm-b29a473e8f6e]

Also known as: UFO, Navigator

Specifications

Movement

Solar

Case Material

Titanium

Case Width

36mm

Case Thickness

10.2mm

Lug Width

19mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

70m

Dial Color

Black

Jewels

31j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1977

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