Seiko Cal. 6645 - 435

Released in 1977, the Cal. 6645 with design code 435 was part of Seiko's domestic market collection. With its 18mm lug width and 14.3mm profile, it sits comfortably on most wrists. [seikata-wm-17d920ce3db9]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.3mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

White

Jewels

31j

Frequency

21,600 bph

Power Reserve

67 hours

Year

1977

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