What is an artists proof ?
Occasionally you may come across a print that has the letters “AP”
instead of an edition number. AP means that copy is an artist's proof -
that is to say a proof printed before the numbered copies of the
edition. AP copies are often retained by the artist to give to friends
and family. They are usually signed, and will often have a number to
indicate how many Artists’ Proofs were created. Some collectors prefer
to obtain artist's proof copies as these can be more interesting and
are rare in comparison to the numbered copies, and if they are
inscribed with a message or dedicated by the artist, they can be very
collectable and as such more expensive.