Hi casscos,
This seems to be a Naples piastre commemorating a trip that King Ferdinand IV and Queen Maria Carolina took to Austria with their daughters. That band on the reverse shows four astrological signs, with the sun in Capricorn. (I know nothing about this stuff; I looked it up.) It seems that these were the signs that followed their departure from Naples. And you can see that the sun is shining right down on the boot of Italy.
According to Krause (a catalog of world coins), these should weigh 27.5320 grams. If you have the coin in hand, it's a good idea to weigh it. It can weigh the right amount and still be a fake, but a significant discrepancy in weight will tell you it's counterfeit.
I don't have the experience to give you an opinion of the coin's authenticity.
Is it just me, or are online language translators messing with us? When I asked for a translation of soli reduci, it came back as "single veterans."
Marianne