I’ve always wanted to know EXACTLY what this thing is. And I finally dug in and found out.
It looked very much like a Nagant to me but, there are some problems. The most damning of which is that the loading gate very clearly swings back on the firearm in the film, but swings out on the Nagant and it’s variants.
http://www.imfdb.org/wiki/Nagant_Revolver
But not too many guns had a rear swing loading gate, and that allowed me to figure out what we’re looking at, and it makes sense that it would be Italian in a low budget Italian movie.
In my opinion Cemetery Man’s Revolver is an Italian Bodeo Model 1889 service revolver.
Here is a link to some wonderful photos of the model in question being sold at auction.
http://www.auctionarms.com/search/displayitem.cfm?itemnum=9187995
And here are all the good angles from the film.
