I found a product page for an Armisport Le Page .45 percussion pistol that appears to be distributed by Chiappa Firearms of Dayton, Ohio..
It comes in a premium set, a cased set, by itself, with a 4.5mm practice barrel or as a target model with a small rear adjustable target sight.
Here's the product page:
http://www.chiappafirearms.com/products/89
And here's a 53 second video showing much of its detail from different angles:
http://www.youtube.com/watch?v=JYOs5RaeJcQ