Date stamps were done on the inside of a drum shell with a abbreviation of the month, followed by the day, and then year.
Date stamps for drums produced in 1960-1963 were strictly red ink, while date stamps from 1964-1969 were red or black.
The boom in production, along with new government regulations, prompted Ludwig to begin issuing serial numbers on badges of their drums.
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There are several ways to date Ludwig drums from all production periods.
The most accurate way to dating a drum is to see it as a whole, and assess every aspect of the drum.
Indicating factors include (not limited to): serial numbers, date stamps, shell mold, shell hardware, finishes, and badges.
Serial numbers don’t directly identify specific drum type or year.
Ludwig shells from 1970-1975 carried the 3-ply maple/ poplar/ maple with the re-enforcement ring construction of the late 60’s.