Assuming you have a rifle and not a carbine and assuming it has a dovetailed front sight there are several dovetail sights available. (Marbles, Pioneer Gun Works, etc.) The issue may be the size of the dovetail. The front sight may have to be fitted to that dovetail. Depending on what type sight is on there now you may be able to put on one of the slip-on brass beads on the existing sight. A little more information and a photo would be useful. Euroarms 1873s are not common and no one makes parts expresslly for them.