They did not take good care of thier guns . Is there 150 years of old rust under the wood , fine pits , solidified oil , etc.etc. ? Or is the rust new ( if any ) ? Does the wood have that 150 year , old growth look or does it look new in the channel and lockwork area ? What about the inletting cuts ? These should answer your questions , if not , lots of better , closer pics of outside and inside.
Chris