DuPont divested themselves of their powder and explosive lines in the 1970s and 1980s so, if it says "doPont" on the can it is a good 35 years old or older. The can should also be metal rather than plastic for that era. The powders usually came in 1/2 pound, 4 pound, 12 pound, and 25 pound canisters rather than 1 pound canisters. There were 8 pound kegs at one time but I can't remember if before or after the sale.
After looking through several sources going back to the 1940s, I suspect this is some surplus, over run, or pull down powder that was packaged and sold to the public. I've seen a fair amount of it over the years and occasionally it was labeled similar to the standard canister grade powders. Most of the time it had a different number but that also tended to be military surplus or pull down and labeled under the manufacturer's numbering system rather than the shelf name. Load data often came with the powder though it was very limited in scope. If one could match the manufacturer's number to the shelf name one could substitute with out issues.
I'd wager this is very similar to PB canister powder. Hodgdon might be able to give some advice but there is a good chance they have no better idea than anyone else as this pre-dates their involvement with IMR powders. One might do better with the bullet companies as they might have run across it or at least have some institutional memory of it.
