I have Meat's Not Meat Till It's in the Pan - Charles M. Russell hand-painted oil painting on canvas and signed by author in old wooden fram?
Do not post in the Answers. Click on the Blue Box, "Edit", > Click on "Update" and finish your question. You Don't, you take it to a proper authentication and s/he will give you An OPINION. Only the Artist could factually answer the question. OR find manuscripts, letters, diaries by someone who mentions it during its original creation. Called Provenance.
It's almost certainly not the original painting. This work has been widely reproduced. It may be a high-quality print done on canvas. Or it may be a hand-painted copy — there are studios in China that specialize in these.