Yes the Siace double is made in Italy. Dewings Rod shop had them for awhile. Saw one advertised about a month ago.
Guns America is how I found mine. I have a hammerless and there is a hammer 45-70 in Guns America now.
The Siace doubles I have seen have been in 9.3 X 74R, 30-06 and 45-70. I found Siace's web site but could not read it. Don't read Italian. New England Firearms use to carry them but when I emailed about them they never answered.
I love my 45-70 and its the double I always wanted. I have several old and new doubles in different calibers. This 45-70 shoots great with a heavy enough load to shoot anything in America. May even take it to Africa the next time I go.
This is the cheapest, funnest, Most practical double for the double lover to shoot.
I'LL try to post a photo of mine when I figure out how to do it.

Sam