When cataloging library material that is signed by the artist or author, add a 500 note. If the library has multiple copies, specify which copy is signed in 500 $3.
Examples:
500 __ $3 MoMA: $a copy signed by the artist. $5 NNMoMA
500 __ $3 MoMA Spec. Coll. copy: $a signed by the author. $5 NNMoMA
500 __ $3 MoMA Stacks c.2: $a signed by the artist. $5 NNMoMA
500__ $3 MoMA: $a copy has "42/50" signed by artist. $5 NNMoMA
Also add
655 _7 $a Authors' presentation copies. $2 aat