— a nine year stretch that produced 348 episodes most of which have been lost. This could be one of them... but it could be difficult to prove.
The clip opens with men singing in harmony, probably the The Riders of the Purple Sage. It's the very end of a song. There is part of a skit, and more music. At the end Roy Rogers keys up his mic and signs off "That's all for now folks. This is Roy Rogers saying to all of you from all of us, goodbye, good luck and may the good lord take a liking to you." Then after a nod to Quaker Oats they cut to the song "Save a Smile for a Rainy Day."
Roy Rogers Lost Episode
But some key details. The Quaker Oats spot lists off Roy Rogers, Dale Evans, Gabby Hayes and the Riders of the Purple Sage. Not all of those members appeared on every season. Dale and Rogers were only married in 1947, and met perhaps as early as 1946 and she is not assumed to be on episodes before 1948.
It's also notable that Quaker Oats cereal was the sponsor only for the 1948 season of which only ONE episode has ever been found out of 138. So odds are this is a "lost" episode. More here.