Another help needed!

I've got this coin, but I can't read its letter or number. There is 50 on the right side, but I don't know if it is value or a part of a date.



Its diameter is around 17.5 mm and weight about 2g.

https://en.numista.com/catalogue/pieces7974.html
or the aluminun-bronze version
https://en.numista.com/catalogue/pieces1644.html

Thailand, 50 satang, 2532

Thank you guys!