From Cyprus, I would assume.
I'm not quite sure what you mean by "cupped at the back". The Cyprus 1 piastre coin is supposed to be flat, so if it's been bent into a bowl-like shape, then that was done after it left the mint.
Here's the NGC database page. These early British Cyprus coins are not common and quite pricey in better grades, but we really need to know if the "cuuping" is actually damage before we can offer a sensible estimate of value.
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