Seiko Cal. 5645 - 651

The Seiko 5645-651 represents an important milestone in Seiko's 1978 lineup. With its 22mm lug width and 9.0mm profile, it sits comfortably on most wrists. [seikata-wm-fff4f5c3d5cc]

Also known as: Helmet, Arnie

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

43mm

Case Thickness

9.0mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Burgundy

Jewels

22j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1978

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