Here's an example from a wheel that has been for sale for half a year in germany: it has 7976
Dated 5 '73, a 1110344 wheel.
From the multiple examples I've seen, I vague recall a lot of them starting with a 7... there must be a system in it.
- Could they be mass matched, so to make up a set of 4 with identical codes?
- Code to identify a specific worker in the foundry?
- Mold code would not make sense, that is probably already in one of the other casted codes
- Production date is already covered to the month
- 4 wheels in a set I have all have s,x, and a number (12,13,14 and 29)
- 2 of the 4 wheels I have also have a large letter E or P inside a circle