Hi Dave.
Go to Ebay and do a search on the exact phase "rim wind" and see what comes up. Both Phinney Walker and Stewart made large numbers of this type of clock with all kinds of designs on the dials. They were inexpensive clocks sold as after market items for car owners. Some have plain dials and some have different kinds of designs on them, many of which seem to be targeted for specific brands of autos. I don't know for sure but I have always assumed that the biplane designed dial was marketed to people who owned Rickenbacker autos. Rickenbackers were a popular auto made in Detroit in the 1920s. The company was owned by
Eddie Rickenbacker of WW I fame. He even used the hat-in-the-ring squadron insignia as his company's logo in the form of an enameled badge that was affixed near the top edge of the the radiator.
Anyway, why not go ahead and keep the current prices, or increase them to whatever you like, and put the list up here on the forum and see what sells? Anything that doesn't sell after a couple of weeks can go on Ebay and let the market decide.