If the rifle is marked M-1867 on the left side of the receiver, it would be one of the Danish made rolling block rifles. It was chambered in 11.35mm which is very close to the 45-70 cartridge.
Have a good day,
Matt
Rolling Block model 1867
Re: Rolling Block model 1867
look up on the google "shooting 45-70 in danish rolling block" and you will find a number of posts on the topic. Here is one you can try
http://www.assra.com/cgi-bin/yabb/YaBB. ... 31567089/0
http://www.assra.com/cgi-bin/yabb/YaBB. ... 31567089/0