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My spare wheel is stsmped AZ, think there's a number before it, and near one lug hole is stamped GM-12. Do these wheels have anything that indicates their ages? Thanks. Have a great day.
By the valve stem hole should be a "K" for Kelsey Hayes, a "1" for the Romulus MI plant, a single number for the year, one or two numbers for the month, one or two numbers for the day and then the two letter identification code, in this case "AZ".
K13 8 19 AZ - would be a Kelsey Hayes (K) wheel made in Romulus MI (1) in the year 1973 (3) in August (8) on the 19th (19) in a 15" x *8" size for a Corvette (AZ). If I'm remembering correctly, the month and day are separated by the valve stem hole?