I'll take a stab at it.
PFLF could be the Goodyear DOT date code/Plant of Manufacture.
P - 1970
F - March
L
F - Freeport
C13L - could be March 13
My Goodyear chart doesn't say what the L stands for
__________________
Ed
1968 GTO (Thanks Mom)
2006 Silverado
2015 Chevy Express 
2024 Cadillac LYRIQ
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