The falling block action Martini Enfield has 2 significant features that I note from the photos.
1. It has the stamp "DP" seen in photo #5 on the top of the receiver ring. This MAY mean that it's been modified or relegated to "Drill Purpose" condition...before you consider firing it, have it checked very carefully, and make sure you have the action taken out of the wood stock to check the condition of the barrel and chamber area that's hidden by the wood. You may find a hole drilled into the chamber.
2. Picture #6. You see what looks like a 6 pointed star on the upper left side of the receiver. This is actually a double broad-arrow proof stamp, with the arrows pointed into each other, indicating that the rifle has been sold out of service.
Hope that helps a bit.
NS