While 12 back proof cards are incredibly hard to come by, blank back proof cards, like the R2-D2 version seen here, are even rarer. Characterized by four square corners, no punch hole, and thinner card stock (similar to POTF proof cards) the blank back proof cards exist in smaller quantities than their printed back counterparts. Of the original 12 Star Wars figures, R2-D2 is unfortunately known to exist in smaller quantities than the other 11 characters.

From the collection of Bryan Simmons.