New 5 | Various European Coins

First is Poland, 3 grosze, ruler: Stanislaus Augustus (Stanislaw August Poniatowski), check the upper left-hand part of the reverse (close to the crown) for the date, 1760s to 1790s.

Second is Austrian half kreuzer of Maria Theresa, if I remember correctly there is no date on these coins.

The last one has some detail from a Russian 2 (if I see it properly) kopeks (the horseman, the scroll w/denomination, the wreath on the obv), 1750s to 1790s, EM mintmark, but the outline of the head (?) on the obverse isn't something that's usually found on these coins...

I suspect it's been altered post-mint, much like the coin in this recent thread has been. Who, what and why we can only speculate, but the figure seems to be wearing a "liberty cap"; I suspect it was done by either revolutionary sympathizers or by French troops during Napoleon's invasion of Russia in 1812.

I also see what may be mount marks on the other side; perhaps it was turned into an improvised badge or button.