Nothing too old. My Browning B78 in 6mm AI is the oldest, but the exact date of manufacture is ??? as the serial number does not follow the documented pattern. The guess based on how other Browning guns were numbered at the time is 1973, but that's just a guess.
There's not too many older cartridges I have much interest in, or at least most of them need re-working. I shoot a .50-110, but it's fast twisted and the Browning action was made in the 90s some time.
