Post 1979 Cambodia does not release imperforate stamps, but for certain issues there seem to exist. They are actually proofs.
These what believed to be colour or plate proofs from the archive of COPREFIL are available on the market as imperforate stamp and souvenir sheet full printing sheets, or single pieces in case of colour proofs. For some issues, designer proofs are on market. Up to date these different kinds of proof of the following issues are found in private collections:
- 1985 JUVALUX'88 Cats
- 1986 Halley's Comet
- 1988 Apsara
- 1989 BRASILIANA'89 Butterflies
- 1994 FIFA World Cup USA'94
- 1994 Tourism - Public Gardens
- 1994 Beetles
- 1994 Submarines
- 1994 Chess
- 1994 80th Anniv of the 1st Flight of Multimotor Plane
- 1994 Indochinese Birds
- 1994 Dinosaurs
- 1994 National Independence Festival
- 1995 Butterflies
- 1995 Protected Fauna
- 1995 Locomotives
- 1997 Khmer Culture - Banteay Srei
- 1998 Chinese Year of the Tiger
- 1998 Defivitives
- 1998 Cats
- 1999 Butterflies
Current market price for most of the plate proof sets is 5 to 10 USD each.
They should not be confused with the de luxe sheets of three 1983 issues: 4th anniversary of PRK, Los Angeles Olympics and butterflies.
There are also printing wastes which found their way to the philatelic market. Collectors are reminded that printing wastes are worthless and forbidden to use as philatelic exhibition material.