Seiko Cal. 6645 - 728

Seiko 6645-728

The 6645-728 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6645 caliber with 25j jewels beating at 21,600 bph, it delivers a 37 hours power reserve. [seikata-wm-608529ed7d47]

Also known as: Helmet, Rally

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
40mm
Case Thickness
10.2mm
Lug Width
22mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
80m
Dial Color
Cream
Jewels
25j
Frequency
21,600 bph
Power Reserve
37 hours
Year
1993

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seikata-wm-608529ed7d47