So, you don't know who made it
Well since this my mild case of OCD kicked in and I started researching the early Replica Arms Colt Walker manufactures. I am now reasonably sure that my Walker is made by A.S.M. I spent the last several days on different forums and this is just one confirmation from the Cap & Ball forum.
Leonard Frank Allen had started Replica Arms, in El Paso, Texas, in 1962, with the first Colt 1847 Walker replica, made by Armi San Marco.
This is from the Colt owners forum.
The early Walker replica made by A.S.M. had a round bolt and cylinder notch.
The replicas made by Uberti and Pietta had elongated bolts and notches.
I also found out where the makers mark was located, on the front of the barrel frame under the loading lever ram hole, even had a picture of the early (I think) Pietta logo.
I couldn't find a picture of A.S.M. or Uberti logos on any early Walkers but they were build and imported prior to the foolish mandated warnings.
When I did the thorough cleaning, I removed the grip and trigger guard and there is definitely no maker mark on this Walker.
Edit:
@Mike I also found out why my Walker flask doesn't throw consistent charges without a drop tube. There are 2 styles of that flask. One has a longer nozzle to clear the wedge and mine has a shorter nozzle that hits the wedge when charging the cylinder.