Pattern 53/3 Enfield rifle-musket. There should be markings on the lockplate and the barrel. Typical lock marking for most is TOWER or ENFIELD and a date in front of the hammer and a crown behind. Some are also marked London Armoury in front of the hammer. There are a few others floating around with other maker's names such as Barnett. It looks as though rust and crud have obscured whatever is on yours. On the left side of the barrel at the breech there should be some proof marks and the number 25 stamped in. This is the gauge number (caliber). There should also be assembly marks inside the lock.
If this a rifle made in Birmingham by one of the BSA makers, this is a handmade gun and will bear marks of the various workmen such as stockers, lock filers, &c. The Enfield and London Armoury rifles were machine made.
I don't believe that we're supposed to give estimates on what a gun is worth on here, but I can say that it's worth many times more than what you paid for it if it's an original. By the way, don't be aggressive in cleaning it. If you go to scrubbing real hard or sanding it and such you will ruin its value as a collectible. I only dream of finding something like this at a yard sale. And believe me, I have looked hard!
:thumbsup: