Seiko Cal. 6643 - 437

The Seiko 6643-437 represents an important milestone in Seiko's 1973 lineup. It features a White dial protected by a Sapphire crystal and offers 100m of water resistance. [seikata-wm-2b5e43512066]

Also known as: Panda, Goldfeather

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

8.1mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

White

Jewels

18j

Frequency

21,600 bph

Power Reserve

42 hours

Year

1973

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