The patent number that is on later Hursts (3216274) was issued 11/9/1965. So should have been made before that, or not "too long" after that.
I assume it would have taken some time after the patent was issued for them to get the revised stamping worked into production -- but how long, who knows? (Like the Patent Pending Delco Remy distributor caps that were sold for several years after the patent was already issued.)
Neat drawings with the patent app:
https://pdfpiw.uspto.gov/.piw?Docid=...iew+first+page
https://pdfpiw.uspto.gov/.piw?docid=...6RS=PN/3216274
__________________
Jeff Helms
65 Z16 Survivor
65 Z16 drag car
66 Chevelle L78 unrestored
67 Chevelle L78 unrestored
67 Camaro SS350 Survivor
Last edited by jeffschevelle; 09-03-2021 at 06:43 PM.
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