Seiko Cal. 6645 - 783

The 6645-783 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6645 caliber with 27j jewels beating at 36,000 bph, it delivers a 40 hours power reserve. [seikata-wm-e8b94917db9b]

Also known as: Tuna, Bullhead

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

12.0mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1998

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