Later on, the pair met at a Screamin' Jay Hawkins show. "It was quite a formative gig for both of us at the Christchurch Blues Club in Madras St. There were about 200 people there. It was probably the nadir of Screamin' Jay's career," remembers Jackson, whose Dr Frankenstein-inspired piece The Monster features on the cover of Diamond Dozen.
"The reason it has that patchwork effect is I've cobbled together old bits of lino offcuts from other work and glued them to a block of wood. If the music is the monster then Delaney is the mad scientist. It's almost sewn together out of chunks."
It's a brutally apt way to describe an album assembled from unreleased and rare recordings from a decade of ceaseless touring and studio work.
The inner sleeve of Diamond Dozen is decorated by another local artist, Samuel Harrison, best known in Christchurch for his sculptures. Harrison is also an award-winning draftsman and printmaker - and a fan of Davidson.
Asked to describe the singer-songwriter, Harrison says: "He's probably wearing a hat and looks kind of angry. I was always keen for people to sit for me. I did something like 10 prints of Delaney last year." One of those woodcuts decorates the inner sleeve.
"It directly complements the music. It has that static thing ... like distortion. It feels like him more than it looks like him," says Harrison, although the likeness is unmistakable.
Five hundred individually numbered and hand-printed copies of the Diamond Dozen LP have headed to boutique record stores throughout the world with only another 150 earmarked for local outlets.
Of those very few remain. The distributor, Southbound, has sold out, but you might be able to hunt down a copy if you're lucky enough to live near a classy little record store.