I took a few pictures of the backside of the cap and compared to a typical
derby cap I noticed a few difrences. The first is on the bowtie cap there is only one thread guide,number two is the shape of the back of the derby cap is smooth while a typical cap has a indentation in the shape of the letter C.Also below the serial number is a letter x compared to a typical cap the X is in front of the serial number
I was thinking they could be late model monte carlo or chevelle
or a Canadian style cap