I kinda remember that sad case hardening finish on the lock of my old CVA Mountain Rifle...that was so long ago. As I recall, the .50 calibre & .45 calibre rifles had the patch-box and were marketed as the Mountain Rifles...the .54 and .58 calibre rifles had no patch-box and were marketed as the Big Bore Mountain Rifles
Right now my old CVA Mountain Rifle has a real nice patina finish on the lock and a greatly faded and worn plum brown barrel. I like the aged look that it has right now.
I've been shooting that gun for so long that the original barrel on the gun has only a hint of rifling left in it, and it fouls bad after only a couple of shots. I've pretty much retired the gun from general use; I don't even loan it out any more.
I read a thread here a while back, and it inspired me. I'm thinking, this summer, I'm going to order in a 15/16ths .54 calibre Corleraine Barrel and re-barrel that gun as a .54, and then convert it to a flintlock with an L&R Replacement Lock...and I have an old .50 calibre CVA Mountain Rifle Kit that I never built. So once that kit's together I'd have a set of these old fine rifles...my grand kiddos will inherit them when I pass on...well, if they want them.
I'm very sentimental towards the CVA Mountain Rifles.