Pitis Identification [解決]

I believe this is a Pitis from talking with other people, however I have not been able to get an accurate identification. The other side is blank. It's about 19mm. Any help in finding which type/variety it is would be greatly appreciated. 

These are what pops up on a search with the photo provided. Around 19mm. More  information such as weight and composition would be helpful. Not everybody knows what a Pitis is or where it comes from. This is the best I could do for you under the circustances. You can search through them and possibly find what you are looking for.

N#109644

N#109644

N#149902

In addition to the helpful Numista references provided by harryg, there's also a good article, with photos, about Palembang coins. 

http://www.fsrcoin.com/palembang.html