As
@TheIronMonkey shared, I did sell a very large collection of class pipes for a friend. Only a few remain. My friend (who authored the Pipedia article on class pipes) had inside information about nearly all the pipes in his collection. For example, a class pipe with a "C" like yours could be connected to any number of colleges that were in existence in 1923. My friend was able to identify, almost without fail, exactly what school the pipe was associated with. With that info, we did attract some collectors of specific colleges. All that to say, see if you can find out if the seller knows anything about the pipes background.