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I think the JJ code would be the one located inside the rim. That's just a designator for the rim style and shape used on Corvettes in the late 60's and early 70's. As I understand it, it's a subassembly code. The code for the entire rim should be located on the outside near the valve stem. So alot of AZ rims (stamped on the outside) would also have the JJ stamped inside.
I think the JJ code would be the one located inside the rim. That's just a designator for the rim style and shape used on Corvettes in the late 60's and early 70's. As I understand it, it's a subassembly code. The code for the entire rim should be located on the outside near the valve stem. So alot of AZ rims (stamped on the outside) would also have the JJ stamped inside.
Some addition info to lbell101's .... JJ was a common industry code for wheel contour (shape) used by many wheel mfrs on many makes. For example, stock rally wheels on my '68 Camaro SS has 14x6 JJ inside & XJ by the valve stem.