I Think This Is Swiss As REV Looks Swiss—identified: 1915 Austrian 10 Heller

It would be helpful if you provide the weight and diameter of your unknown coins.

Than said, this is a 1915 Austrian 10 Heller coin. It's a copper-nickel-zinc alloy coin and should measure 19mm in diameter.

These Austro-Hungarian coins can cause some confusion due to their lack of legends or inscriptions. The empire was a multi-lingual and multi-ethnic nation, so (as with Switzerland) putting just one language on the coins would have been limiting for the speakers of not-that-language, and squeezing all of the languages onto a tiny coin is impractical; the remaining choices are to use Latin or some other "neutral" language, or to avoid language entirely. Switzerland chose option 1, Austria chose option 2. Anyone within the Empire at the time would have recognized the crown and coat of arms as their own.

The old Krause catalogues used to have an "instant identifier" page to help with coins like this that had no obvious country-name on them.