Seiko Cal. 6644 - 763

The Seiko 6644-763 represents an important milestone in Seiko's 1986 lineup. Powered by the 6644 caliber with 24j jewels beating at 21,600 bph, it delivers a 65 hours power reserve. [seikata-wm-0ad80a2e859f]

Also known as: Rally, World Timer

Specifications

Movement

Solar

Case Material

Titanium

Case Width

40mm

Case Thickness

12.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Burgundy

Jewels

24j

Frequency

21,600 bph

Power Reserve

65 hours

Year

1986

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