Seiko Cal. 6643 - 155

The 6643-155 is a sought-after Spring Drive piece from Seiko's golden era. With its 21mm lug width and 10.5mm profile, it sits comfortably on most wrists. [seikata-wm-bbee4cc1df17]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

42mm

Case Thickness

10.5mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

Black

Jewels

34j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1972

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