I have a rifle in my posession which seems to be a combination of the Berdan and 1891. The actual appearance is more Berdan but it has a magazine. There is a date stamp of 1882. The safety is a blade affixed at 12 o'clock at the extreme rear of the bolt. There are three barrel bands and there is a washer/nut that must be loosened on the top of the bolt to remove it. I will post pictures or a link to the mosin forums when I get a chance.
A little more research and we were able to figure out it is a Serbian Mauser 80/07. The thing is so rare, we couldn't find pictures or info anywhere.