Need help identifying manufacturer of a vintage smoking pipe stamped with the letters O.D. inside an oval?

I would like help identifying the manufacturer and age of a vintage briar wood smoking pipe which has the following markings on it: 1) the letters "O.D." inside an oval with the words "DE LUXE" underneath stamped/etched on the flue (the tube shaped extension of the bowl that the stem inserts into). It has a leather trimmed case with a plush gold inner lining, and a red oval paper stamp inside with the letters "O.D." on it. I have found information on Pipewiki stating that Dunhill stamped their pipes "OD" if they were designed by a customer in which case it stood for "Own Design". Dunhill :OD" pipes are supposedly very collectible and I'd like to confirm that the pipe I have is in fact a Dunhill. There are no other markings anywhere else on the pipe or case that would indicate Dunhill manufacture. Any help would be greatly appreciated.