When the band that would become KISS started rehearsing as a three-piece Paul "graduated" from stock guitars, having played a variety of different guitars in his formative years, to a more or less custom hand-built Doublecut LoBue. "When we [KISS] first got together, Charlie LoBue had a shop in New York called Guitar Lab and he used to make some wonderful Instruments." (Guitar Player 1978) The Doublecut that Paul bought looks very similar to the custom one built for John Gatto of the band Good Rats around the same time so I'm going to assume that the specs were at least similar (Paul has referred to it as "one of Charlie's stock models"). The double cutaway body and neck were probably mahogany with an ebony fretboard since that's the configuration of all the known LoBue Doublecut guitars from this time. The bridge/tailpiece combo was probably a Gibson while I'm going to assume that the pickups were DiMarzio* but under the LoBue name. (At the time Larry DiMarzio worked for Charlie LoBue under the guidance of Bill Lawrence and, as we know, DiMarzio was a friend of Gene's since college. It was under the tuteledge of LoBue and Lawrence that DiMarzio began development of what would become the legendary Super Distorsion. See also the info in the Gibson Flying V section.) The guitar also had creme binding on the front, the neck, and the headstock. "On the first album, I was using a custom-made guitar by Charlie LoBue, who at one point worked for Dan Armstrong in New York. Then, he started his own place called Guitar Lab. He made my first custom guitar. It was really based on Gibson principals. It was kind of like a double-cutaway with binding on the front and two humbucker pickups." (Vintage Guitar March 1997)

Unsurprisingly there are relatively few photos of the band from this early period of the band but the LoBue was in Paul's hands in late 1972; the top photo on the right is either from November or December of that year. The LoBue Doublecut was probably used for the very first show the band played at the Coventry on January 30, 1973. The photos taken by Lydia Criss doesn't show much but there has been no mention of any other guitar from those days. For the March gigs at The Daisy however, we do see a guitar that matches the one from late 1972.
* An assumption that's been echoed by Paul: "I would almost bet that the first pickups in my Guitar Lab guitar, which Charlie LoBoue made, were DiMarzio pickups." (Vintage Guitar March 1997)
The basic principles and the craftmanship of the LoBue obviously impressed Paul since he opted for another LoBue custom, this time a Flying V design, to replace the stolen Doublecut. "At that point, he made me a short-wing Flying V. I really liked the V Albert King used, the one with the binding on it. I told Charlie to make the upper wing shorter than the bottom one. We took the template of the body and I drew where I wanted the wing to be and he made it." (Vintage Guitar March 1997) "The [Doublecut] guitar that Charlie made me got stolen, and then he made me a beautiful V guitar with one wing that was shorter than the other and a beautiful ebony fingerboard and a lot of abalone [...]" (Guitar Player 1978) Since the binding on the body, front and back this time, and neck appear to be single-ply celluloid the abalone that Paul mentions probably refers to the rectangular inlays (and possibly the truss rod cover). The headstock was unbound. The guitar had two chrome-cover humbuckers, most probably wound by DiMarzio, a slightly asymmetrical array of the 4 knobs, and a curious placement of the toggle switch (see below). It also had what appears to be the Schaller Harmonica bridge that Gibson used on some SG's from 1973 (Custom, Standard or Special) and later on the L6. The first known picture of the LoBue V comes from the show at the Coventry in Queens on December 21.
[Above and right] A closeup comparison between the bridge of the LoBue V (the best pic available) and the bridge of a 1973 Gibson SG Custom. Closeup also shows the somewhat curious placement of the toggle switch of the LoBue V.
The LoBue V carried the touring load for the first half of 1974. It was there for the legendary New Year's Eve triple bill at the Academy of Music, The Casablanca launch party on February 18, the taping for ABC's In Concert on February 21, and the more or less infamous appearance on the Mike Douglas Show taped on April 29. The pictures below are some of the better ones available that show the guitar from various angles. Unfortunately this guitar would also get stolen, this one when KISS decamped to Los Angeles to record Hotter Than Hell. "We went to Village Recorders [sic], and the first day we set up, Paul's guitar was stolen". (Kenny Kerner, Behind the Mask p. 222-223) Apparently somebody just walked into the studio and claimed he was there to pick up some guitars for KISS. The last known picture of the LoBue V comes from 1974-07-25 in London, Ontario, Canada. Recordings for Hotter Than Hell began on August 16 after which the LoBue V was never seen again.
[Above] Paul playing at the Casablanca "coming out" party thrown by Warner Bros. to celebrate the release of the first KISS album.
[Right] Paul tuning up backstage in Atlanta 1974-07-18. A nice shot of what appears to be chrome tulip-style Grover tuners on the LoBue V and a bonus look at the modified heel of Ace's Tobaccoburst Les Paul.
[Above] "So when I asked Charlie [LoBue] to make me a Flying V, he showed me a drawing/buleprint for it, and I said make the upper wing shorter. I showed him how I wanted it cut, and he thought I was nuts." (Guitars That Rule the World in Metal Edge presents KISS Alive 1996)
The Doublecut LoBue unfortunately wouldn't stay in Paul's possession for very long. In the summer of 1973 it was stolen but, for some unknown reason, the story of what happened has been told several different ways. "That [guitar] was stolen before we went on tour after the first album was done." (Vintage Guitar March 1997) Thankfully, that is the lone dissenting story and all other quotes point to the same date: "At our first show we did as a New York band with The Brats and Wayne County [...], at the end of the night in the thick och everything going on [...] the guitar got stolen." (Guitars that Rule the World in Metal Edge presents KISS Alive 1996) Considering the details of this second anecdote that would be the show on May 4 which KISS Alive Forever also identifies as the time the LoBue got stolen (see p. 18-19) as does several quotes from Nothin' to lose by Ken Sharp. Eddie Solan: "Paul and Gene had matching custom-made bass and guitar, which was made by a Manhattan guitar maker named Charlie Le Beau [sic]. Somebody stole Paul's guitar that night and he was devastated." (Nothin' to lose, p. 99 of the eBook) The only photo from that show that I know of (that is usually misdated as the June 1 show) doesn't really show what guitar Paul is playing but the Les Paul that Paul got and played for the remainder of the year had binding on the back which the guitar from the May 4 photo didn't. "It was a shock but not a big setback. [...] It didn't matter, your guitar was gone, buy another one and keep rockin'." (Ibid)
[Right] It's a little uncertain from which one of the March gigs at The Daisy this photo is from but the concensus is that it is from March.