Take a look at the "Ko" makers mark on this screwback
http://search.ebay.com/_W0QQsassZfig...lot1916QQhtZ-1
Besides that--it's a KO "screwback" I don't think so
http://search.ebay.com/_W0QQsassZfig...lot1916QQhtZ-1
Besides that--it's a KO "screwback" I don't think so
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