The Veleno Original is the strangest guitar Ace has ever played, and it earns that distinction by a wide margin. The Veleno is really the only guitar that featured an all-aluminum construction; there have been plenty of "metal neck" guitars but the Veleno really went all in. Although originally made using cast technique the process was soon changed to carving which means that the two sections of the body, front and back, are machine carved from two solid blocks of aluminum resulting in what is essentially a hollow-body guitar. The electronics are fitted from the back of the front piece which means that in order to access it you need to open up the back and remove the entire back piece
. (Anyone fortunate enough to own a copy of the November 1988 issue of Guitar World can see how a Veleno looks disassembled.) 
Despite being a high-profile guitar that was played and owned by a lot of famous guitarists  (and some that were just famous for other reasons) the production was small-scale. Veleno built all of his guitars himself and he did so by hand, even going so far as to assemble them at home in his living room while watching TV which he credited with holding production costs down! The distinctive headstock, which is supposed to resemble a "V" for obvious reasons, was an idea given to him by one of his children.
First to clarify one thing, the guitar Ace played was a Veleno Original. It has been stated on some sites that it was a Veleno Traveler but the Traveler, as the name implies, was a short-scale travel guitar originally conceived for B.B. King that was actually tuned up a minor third. Design-wise it looked, for lack of a better description, somewhat like an arrow. With that out of the way, let's take a look at Ace's Veleno Original.
Ace first shows off the Veleno at the rather odd photo shoot on March 20, 1975 and it reveals a number of details.  First, this particular Veleno
had Gibson humbuckers which was the most common choice even if some were built using Guild pickups and, later on, DiMarzios. Quite unlike most Velenos, Ace's guitar has five control knobs, two mini switches on the upper horn and one on the lower whereas the more "standard" setup was four knobs and one mini switch on the upper horn and one on the lower horn. The lack of a pickguard is curious as those were added as standard when the body parts went from being cast to being machined but it's fairly easy to remove a pickguard.
By the time the Veleno sees action on stage the pickups have either been changed or the pickup covers have simply been removed. It looks a little more polished than it did in March but the control arrangement identifies it as the same guitar. When it comes to pictures showing the Veleno it is one of the more elusive guitars Ace has ever played. The two live pics presented here are two of three I've seen, and from just two different shows, making it about as rare as the cherry Coronet from the club dates. Despite this it appears as if Ace kept the guitar as it shows up in the 1977 Music Life Special.  It was later either sold or bestowed upon someone as a gift and in the mid-90's it was part of Bill Baker's collection (as seen in this pic
from Bill's excellent web site).