Fender tag stamping…what could it mean?

[woodwiz]

Have 70 RR with what I believe is the original fender tag. This car is not #’s matching but that’s ok! It’s a driver. The vin# on the dash and core support are the same. There is a mark or stamping on the fender tag that I hope someone can figure out. It looks like a H on its side.
Any ideas?
Thanks!

 

[torredcuda]

I believe it is an assembly line inspectors stamp, not sure what it is specifically for though.