Apart from that, I just believed in the date my swap partner had given 2013 = 2556 พ.ศ.๒๕๕๖, but in reality it is 2006 -2549 พ.ศ.๒๕๔๙, I just verified, so of course it all went wrong, also the search because of the wrong date.
Sorry for disturbing you all. It taught me from now on to check the dates on received coins myself, and don't believe in my partners…..
Globetrotter
Coin varieties in French:
https://monnaiesetvarietes.numista.com