Printing plates are an absolute bear to sell. I found a couple of Michelin (sp?) Tire ones from who knows when that went for all of $8 each. The Columbia was an interested car though. They were one of the first companies to work with electric cars, and a false frame design that Ford later ran with. This is all assuming I'm thinking of the right Columbia auto company, but I'm pretty sure I am.
I also just checked a new book I picked up last week. A 1953 copy of 'Those Wonderful Old Automobiles'...and Columbia didn't make the cut I'm afraid. I doubt that there's much value there honestly. The car is old and obscure enough that there are no clubs for them, and while printing plates are cool from a historical standpoint, they're difficult to display and not very neat to look at.