I was given about 3 pounds of WW296 powder. I wonder if there is a code that would indicate the date of manufacture. I can make out numbers of 296 048 TD1 on one can and 296 08 3BB3 2A on another. Prices on the cans are $9.95 if that will give you a clue.
The powder looks and smells good but top of cans show some rust.