Seiko Cal. 6691 - 668

Seiko 6691-668

The 6691-668 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6691 caliber with 27j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-1ace490454e0]

Also known as: Sumo, Bullhead

Specifications

Movement
Hand-Winding
Case Material
Titanium
Case Width
39mm
Case Thickness
14.7mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
140m
Dial Color
Blue Sunburst
Jewels
27j
Frequency
36,000 bph
Power Reserve
71 hours
Year
1999

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seikata-wm-1ace490454e0