Ok I will forward your information on and consult with him again. He is in Persia and doesn't have much access to records but I trust him as an expert, will update you if he can find much else. He mentioned the writing is “peculiar local”, which I interpret as it being from quite a small area, kind of like say coins from Namur, Belgium would tend to only have circulated there and once they have left they become novelties to travellers rather than legal tender.