EXCAM INC HIALEAH FLA. as far as I know no longer exists as an importer...
I may have morphed in to another name ...
But if memory serves me... they got in to hot water with the BATF, offering full auto mod. instructions & parts for the Mac 9 .
It's been awhile seems lile maybe 20 years...
You gun is made by Armi Tanfoglio Giuseppe ..they made/make several little Auto loaders is 22, 25 & 380 and they were not bad.
I see them from time to time offered at $250-350..
I'm not real sure about your Revolvers value I'd say maybe $100-200