Yes Dave, a different rifle.
In 2002 Mike Branson, Jack Brooks and I stocked rifles and pistols for the latest Alamo movie, and the props folks looked at the Dickert rifle in the museum with us. The rifle has more of a Lehigh stock pattern, different mounts, and a
lot of wood around the lock - looked like a contemporary restock of old parts, not what we see on old rifles or Dickert's work. There were several stories - one that this rifle was made up in the 1920's or 30's of parts donated, which may have been found in the general area. At some point they were making a replica of the rifle to raise funds for a museum. Here are couple pics below.
Movie folks wanted something else, that would have been common in 1820's and 30's, which we provided. Then plans changed, and Mike Branson made a pair of rifles in 1780's Dickert style, which Billy Bob used in the movie.
This could be another, later original Dickert / Lancaster trade rifle, or could be a contemp rifle with age. A touchy topic. Bob