Seiko Cal. 6647 - 763

The 6647-763 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6647 caliber with 21j jewels beating at 28,800 bph, it delivers a 71 hours power reserve. [seikata-wm-335f374cc75d]

Also known as: Rally

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

36mm

Case Thickness

15.7mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

21j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1997

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