Nitro base coat. They just don't put the gloss nitro top coat on them. So you do have to be careful if you are planning to spray nitro on top of that - the wet nitro will dissolve the paint already on the guitar, so you basically have to strip the top to do it right.
Can you paint over the bare wood with the Stew-Mac product??? If it's a nitro lacquer base, spraying enamel over it would be a better thing than a full strip....

