My dad (age 85) bought one in need of repair at a yard sale. Handed to me to make functional again. This one was made in 1901. I have had a good deal of luck but still have a couple of questions. 1) The forend is definitely not original... but it works. I am finding originals RARE. I think...

Going through my uncle's estate to catalog, and had a few of these walnut forends. This one is marked Colt, but I do not know. Had a recessed area that looks like for base metal of some sort. Any help would be appreciated as to what gun this would be for. Thanks.