Dean, it is hard to date the blue and yellow box Super-X 2 9/16 inch 16-gauge shells as they never got the Super-Seal crimp. Roll crimp right up to the end of them circa 1961, whereas the 2 3/4 inch 16-gauge Super-X got the Super-Seal crimp in 1948. But, by the knurled style canular on the brass I'd say there is a good chance they are pre-WW-II.
Destry, your Super-Seal Crimp shells could be as late as 1960/1 and probably started life with much longer lasting primers than the shells I got from my late Father-in-Law's shop building.
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