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I put together a brief description of the flow for making dies for Wheat Cents, and the types of errors that could occur at each step. I think this flow continued on until perhaps the mid-80s. If you see any error let me know.
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Galvano was made with any design changes, and only had the 19 of the date
Master Hub was made from the Galvano with reduction lathe
Master Die was made from the Master Hub. Errors result in Master Die Doubling
The final two digits of the date were punched into the Master Die
Working Hubs were made from the Master Die. Several Working Hubs were made each year. Errors result in Hub Doubling
Working Dies were made from the Working Hubs. Many (hundreds) of Working Dies were made each year. Errors result in Doubled Dies
Mintmarks were punched into the branch mint Working Dies, which were then shipped to the branch mints. Errors result in Repunched Mintmarks
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Galvano was made with any design changes, and only had the 19 of the date
Master Hub was made from the Galvano with reduction lathe
Master Die was made from the Master Hub. Errors result in Master Die Doubling
The final two digits of the date were punched into the Master Die
Working Hubs were made from the Master Die. Several Working Hubs were made each year. Errors result in Hub Doubling
Working Dies were made from the Working Hubs. Many (hundreds) of Working Dies were made each year. Errors result in Doubled Dies
Mintmarks were punched into the branch mint Working Dies, which were then shipped to the branch mints. Errors result in Repunched Mintmarks