Seiko Cal. 6640 - 548

The Seiko 6640-548 represents an important milestone in Seiko's 1971 lineup. Powered by the 6640 caliber with 35j jewels beating at 36,000 bph, it delivers a 59 hours power reserve. [seikata-wm-6c6bf0e8f92a]

Also known as: Bullhead

Specifications

Movement

Solar

Case Material

Titanium

Case Width

40mm

Case Thickness

14.9mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

100m

Dial Color

Cream

Jewels

35j

Frequency

36,000 bph

Power Reserve

59 hours

Year

1971

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