Seiko Cal. 5648 - 640

The 5648-640 is a sought-after Spring Drive piece from Seiko's golden era. With its 18mm lug width and 11.2mm profile, it sits comfortably on most wrists. [seikata-wm-268c49bb1ad3]

Also known as: World Timer

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

11.2mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1971

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