Seiko Cal. 6640 - 845

The Seiko 6640-845 represents an important milestone in Seiko's 1993 lineup. Powered by the 6640 caliber with 21j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-471dae2577ea]

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

120m

Dial Color

Burgundy

Jewels

21j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1993

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