I’ll stick with the US coins. That’s where my heart is and I would embarrass myself trying to date some of the Byzantine stuff I have. Oldest is 1785 Bar token and I have a 2020 ASE momma sent me last year for my birthday. It’s at the office so the photo is missing in action.
Dated coins: 1663 Crown to 2020 Silver V75 Eagle (from the mint) I also have a Henry II 1180 silver penny
1636 (ND) Japan 1 Mon "Kan'eitsūhō" (old type; modified letter) to 2021 US Silver Eagle and Tuskegee Airmen Quarter P and D mint marks. As for a continuous run 1829-2021.
My oldest is this 1573 Swedish 2 ore and I have a few 2020s. But I only have a handful before the 1700s because I don't like the cruder coins as much.