Havent seen this before. Haha! Not the Silver. By it. Stands out pretty good. I know that one isn't Silver
Thats a thick coin. based on the reeding, it's certainly not Euro. South America? I get those in rolls sometimes, typically Panama but this one doesn't appear to be Panamanian.
I have my own bad habits as well. But fine, take your time, and leave me hanging.. Just messing with you.
here is a nice website managed by uCoin.net (the Numista before Numista) that is a date converter I use oftentimes. http://dateconverter.net/thai/๒๕๕๐/?hl=en
Sorry, well I gave a site for future reference If you have a copy of Krause, it also has conversion tables in the front of the book. I don't have mine with me, but it is helpful for those who don't like the web.