Aviation signs are tough. Some of the most desirable signs out there have an aviation theme to them. Clipper, Harbor, Sinclair, Socony Aviation are some of the more sought after signs out there. I've been looking for reasonably priced examples for years to add to my collection.
But on the other side of the coin, there are quite a few Aviation themed signs that can be purchased fairly reasonable. Unfortunately I don't have many aviation themed signs but I might have a pic or two of some unique ones I can add.
Best of luck in the search and let me know if you come across an extra Clipper, Harbor, or Sinclair sign for sale.
Chuck
Signs Wanted: Sunset, Clipper, Harbor, Indian Motorcycle, Powerlube, Beacon, Michelin, Conoco MM