I know this is from Thailand, but I can't figure out the year or denomination. It is 27 mm, and I think the numbers of the year on the Thai calendar are 25x5, but I can't get the third digit. It looks like a rectangle and that isn't in the chart in Krause. It doesn't seem to match any of the photos in the book. I figure it has to be at least 5 baht, more likely 10.
Looks like 2505 which would make in 1962 I believe; http://www.ngccoin.com/poplookup/wo...gory=54661&worldcoinid=148274&FromSearch=true