This rare item is currently up for auction on eBay in case you have an extra $3,000 lying around. It reads:
Good Luck to Mrs StewartShe is the best in the
world shall always like
Glasgow as long as Mrs
Stewart there and her
two daughters
Charles Chaplin
Fred Karno [?]
Perkins, M P.
Empire
"Perkins, MP." (or "Mr. Perkins, M.P.") was a Fred Karno sketch in which Chaplin had a small role. "Empire" = the Empire Theater in Glasgow.