From the picture it looks like a Pilot that has been converter to an Air-1. From the angle it is hard to tell for sure, but the difference is that the cap on the top of the regulator is taller when the regulator was converted.
In the picture I am referring to the round cap to the right of the mouthpiece. If it is an original pilot, that cap is very flat and from this angle you would only see the edge. It seems that we can see a bit taller piece, but it would be best to see other pictures, to be able to make a positive identification.