Not to burst bubbles, but the oblong DuPont cans were what we bought in at least the early part of the 1960's. The labels say "1924", but they all say that. One of several I have left has $1.60 price written on it. Hogden metal-cap cans I still shoot from were $3.00. Plastic-stoppered cans are not antique. Neither is anything with a "zip code". While, in my experience, old black powder still burns after many years, old caps I've had become more "disappointing than devastating".
Then again, to old guys, much of our stuff is ...just old stuff to us. Can't see the fun in coil spring locks, plastic anything, 209 primers, nor much else on store shelves. But, for every pot, there's a lid and money talks. Old stuff has one thing new stuff don't --memories. Priceless.