I concur with Tac on this and yours being in the 50000 serial number range will be entirely Italian made. I’ve sold Italian made 2 & 3 band rifles & find their price is always lower than a comparable Birmingham made rifle. I’ve had a few Parker Hale muzzle loaders & can’t argue with their quality. I’ve currently got 2 band & 3 band rifles here at the moment in excellent condition. Having shot Parker Hale muzzle loaders for years they’re excellent to use & a faithful reproduction of the original rifles.
Good luck with your sale