I am new to this forum but would appreciate any help/info. you can give. For many years I have had a cased Kershaw knife that has been scrimshawed with a fish scene. It is signed "Walter Alexander", AP 1985. It is accompanied by a certificate signed by Pete Kershaw, Date-1985, model is blank and the serial number says "Artist Proof". I have found such knives noted with serial numbers but have never seen an "Artist Proof". Is that more rare? Is there any collectibility to these knives? Would appreciate any info. you can provide. Tim