Team BD HQ has come across some Artist’s Proofs of long sold-out limited-edition photos. An Artist’s Proof is a small quantity of extra prints created in addition to the edition run. All were signed by Billy and Mick at the time of the original photo print and are identical apart from the fact they come marked with A.P. rather than a number (i.e. 1/15)
Here is the original info on the photo from 2018…

This photographic print was produced exclusively for www.billyduffy.com in an edition of only 15. The photo by Mick Peek was taken of Billy playing his “Baby” Gretsch G2228 Players Edition Jet live with The Cult.
Measuring 16” x 12” (approx. 41 x31cm) with an image size 23 x 33cm it has been printed on Professional Fujifilm 250 gsm Crystal Archive DPII paper.
The photo has also been hand signed in black pen by Billy as well as numbered and signed by Mick.
For authentication the photo also features an embossed 'Billy Duffy Official Merchandise' logo.
It will be shipped in a sturdy cardboard tube via tracked mail from the UK.