NORTH KOREA (1976) Satellites*. Airmail letter to US fantastically franked with Michel Nos 1492-7 perforate and imperforate and Block 24B imperforate.
AVAILABLE AT $80
BHUTAN (1971) Lunokhod*. Conquest of Space Series simulated 3-D stamp used on registered cover. Scott No 127, Yvert No 293. These stamps were sold primarily to dealers and collectors and were hardly ever used on cover. Only 5 such covers discovered so far!
AVAILABLE AT $150