I contacted Dr. Gatto a few years back when I was thinking about buying one of his matchlock pistols. He replied saying that he was establishing a U.S. agent, but subsequent emails have gone unanswered so I don't know if anything ever developed in that regard. My interest cooled somewhat as the competitions I shoot in require any replica arm to be authentic to an original design. Despite Dr. Gatto's claim that it was copied from a German pistol I have been unable to find any authentication that such European-made matchlock pistols existed. The one he shows has the lines of a later wheel-lock but with a matchlock installed, all the European matchlock pistols I've been able to find are very eastern in their lines with only a slightly downward angle to the grip, unlike the more conventional pistol grips of later development.
That being said, from the photos on his website, his guns did look to be of better quality/finish than the Indian-made ones that are currently being imported. If anyone has any current information on Dr. Gatto & his offerings I too would be interested to hear their opinions.