I'm coming to you for help identifying a coin I picked up today. All I know about it is that it's about 19mm across and written in (some variant of) Arabic script. The star symbol is a mystery to me, as is the unit of value. It has a value of 20, but beyond that, the best I can make out the text is as follows:

شهراماثی (transliterated: sh-hrama-th-y)

۲۰ (20)
پر? (p?r..?)
كوپری و وری س...؟ (kupry w wry s...)
(The first word at the bottom could very possibly say "copper" (kupr, as far as I can tell, which translates favourably assuming it's all one word!).)
Do we have (m)any Arabic/Urdu/Farsi/Kurdish speakers here?? I don't think it's Arabic, due to the presence of the letter 'p' (the first letter of the monetary unit, after the 20, possibly also containing an 'r' and an 'm'), so it's likely to be one of the other three.
The only other thing I can add is to note that on the side shown in the first picture there is a faint pattern of rushes or reeds or something.
Any ideas very welcome. Thanks!