[Mr. Chevy]

While I was detailing my wheels today, I located what looks like date codes stamped on the backside of the wheel on the edge, opposite side where the tire bead seals.

Anyhow, there is 6 3 60 on three of the wheels and 6 4 60 stamped on the the 4th. I'm guessing June of 1960???????

Anyone know for sure if these are in fact date codes?? I thought these wheels came out late 60s, early 70s?????

Thanks..

Rich