Most if not all of the chassis in Mark's photo are from the 80's, and I suspect Pablo's chassis is also. The early days of G15 and its chassis and cost restrictions prompted a bunch of relatively simple production chassis designs, chassis kits, and chassis components. The brass winged nose on Pablo's chassis is the one Parma sold and is on the Parma Monorail chassis that Mike Swiss has shown. Other brands may have sold this nose, too, but I acquired all mine from Parma. I've seen this pre-formed .078 main rail , sure I used a few, but don't recall who was selling it, maybe Parma again. The chassis design features are all pretty common to chassis I remember from the 80's. They may have originated in the 70's, but were clearly used by various people in the 80's. There were more than a few racers building chassis like this in that period including me, so unless someone recognizes the identifying engraving, it'll likely be difficult to make a specific ID.
Boxstock 15 came along circa 1990 and continued the production of these simpler mono rail chassis. Another common production chassis was the one sold by ProSlot, Racer-X, and RTR. It has a wider 1-piece pre-formed .078 main rail using a distinctive and wider-between-the-rails nose, around 1.5" wide, and the wider rail spacing required using narrower 5/8" wide pans.
The hinged pans have already been identified as not legal for G15. Wire chassis like this were common in lower cost classes in regional and raceway series beyond G15 where the hinged pans may have been allowed. This might not even be a wing car chassis.
The front wheels also look very 80-ish.
The Parma nose was 1.375" wide between the .078 monorail with full "unclipped" wings. The Camen winged nose chassis with which I'm familiar all used a 1.25" wide nose between their dual rails; an outer 1-piece formed .062 rail with .055 inner rails. The "wings" were "clipped" to reduce weight. I'm only familiar with a single Camen chassis using a 1-piece formed .078 rail, an inside gear G15 that was a very different configuration from this. Yeti was a prolific builder of production chassis in the 80's, and I'm only familiar with a few of them. Those I had all used a 1.25" nose with "clipped" wings . The Camen and Yeti noses were distinctive enough to know Pablo's chassis is neither of those. The chassis in question doesn't look like the examples of those 2 brands I've seen.