Seiko Cal. 6643 - 137

This Hand-Winding model from 1971 features a 45mm Two-Tone case. It features a Green dial protected by a Acrylic crystal and offers 100m of water resistance. [seikata-wm-cbe781b722f7]

Also known as: Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

45mm

Case Thickness

13.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Green

Jewels

36j

Frequency

36,000 bph

Power Reserve

47 hours

Year

1971

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