Seiko Cal. 6663 - 727

Seiko 6663-727

The 6663-727 is a sought-after Solar piece from Seiko's golden era. Powered by the 6663 caliber with 18j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-e6064f5ef107]

Also known as: Sumo, Helmet

Specifications

Movement
Solar
Case Material
Stainless Steel
Case Width
37mm
Case Thickness
11.1mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
40m
Dial Color
Black
Jewels
18j
Frequency
21,600 bph
Power Reserve
54 hours
Year
1993

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