Paint code “Unknown at this time “

No idea. I was just going by F is 1970, G is 71, H is 72, they skipped I as it could be taken as a 1 so J is '73 ! Why not just get the correct F8. 2018 isn't bound to be it...
I will try the automotive paint store around me again. But the chip they showed me didn’t look right. Wondering if it was the newer color they showed me? Thanks