I don't know how common this photo is, but recently ran across this in the January 5, 1941 Lexington (KY) Herald-Leader.

It accompanied the preview of a game held in Lexington between the Original Celtics and a team from Louisville called the Edentide club. Edentide apparently was composed of former collegians, including UK players Layton Rouse and Warfield Donohue.
As it turned out, Edentide won the game. A couple of notes:
- According to the article(s) the Celtics had previously played in Lexington was "in the Jazz age" (if anyone knows the exact date I'd appreciate knowing what it was)
- The game was for charity promoted by the Lexington Lions Club. The Celtics agreed to only take expenses for the game, at the request of Adolph Rupp.
- According to the article Rupp was "largely responsible for urging the Celtics to appear here. Rupp said he thought the hundreds of basketball maniacs in this region would be interested in watching the best team in the world."
- Edentide ended up winning the game 44-41.
- Bobby McDermott, who had been banged up earlier in a game against the Kautsky's did not play. According to the post-game article he was treated by UK's trainer Frank "Skipper" Mann but was not good enough to go.
- McDermott's replacement was Ash Resnick which the paper described as "a bruiser who played once upon a time for New York University, and is no dream player."
- High scorer for the Celtics was Nat HIckey with 20 points on 10 field goals. Paul Birch added 14 points. High scorer for Edentide was Harry Blandford with 16 points.
- According to the article "The Celtics apologized in the dressing room after the contest for not being more clever. 'You can be funny when you're way out in front.' said Banks, 'but we were behind all night and we didn't feel funny. Next time don't get us such a tough team.'"
FWIW, the reason I was looking for this in the first place was to try to find any more information about Rupp's relationship with the Celtics. It's my understanding that he had watched and known well the Celtics from at least the early 1930's if not sooner, and had adopted some of their play into his own teams (in particular the "Wheel" which was the centerpiece of his pivot-post offense.)
If anyone know any details about this, let me know.
Jon