Seiko Cal. 6640 - 617

The 6640-617 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6640 caliber with 31j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-abbece56dce9]

Also known as: Samurai, World Timer

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

38mm

Case Thickness

15.6mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

150m

Dial Color

Silver

Jewels

31j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1971

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