My father is law came across this rifle, and apparently the owner has no issues parting with it. I could use some help identifying it from the pictures and description he gave me. The barrel is 44", and rifle is 59" overall. He put a caliper in the bore, and estimates it as a .54 Cal. Some rust and pitting on the tang, barrel, and inside the bore. The marks I need help with are a stamped pheasant on the lock, along with the letters "L.C.C & L." Any thoughts or ideas?