Seiko Cal. 6647 - 413

The 6647-413 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 11.4mm profile, it sits comfortably on most wrists. [seikata-wm-cece636cb098]

Also known as: Tuna, Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

46mm

Case Thickness

11.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

100m

Dial Color

Burgundy

Jewels

28j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1974

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