Finally, an observation.
Many people who collect "Islamic coins" draw the line at including Indian coins in their collections. The Indian Islamic series is simply too broad, complex, and mixed up with non-Islamic native coinages; Indian coins are thus typically tossed into the "too hard" basket (much like many collectors of mainstream world coins often do), leaving them for the Indian coinage specialists. The Stephen Album book "Checklist of Islamic Coins", for example, specifically excludes them.
Thus, for all practical purposes, Indian coins are "not Islamic" - despite clearly being in Arabic script, making frequent mention of Allah and occasionally quoting from the Qu'ran. If you have an unknown coin with Arabic writing on it, it's OK to call it "Islamic", but if you know they're Indian coins, then it's probably best to call them "Indian", rather than "Islamic", to attract the attention of the correct experts.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis