A brass disc riveted on the roll hoop would be a SCCA ID plate. I've seen similar on 1972 F5000s but in later years they just stamped the number onto the roll hoop. The number 20.FB.14 is perplexing as it appears to indicate the 14th Formula B car registered in Region 20. Wherever region 20 is ...
Do you have a picture of the plate?
Allen
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