That Ammaco looks very similar to a Falcon Pro...
My old Falcon Pro Race Flyer.
Same rear chainstay gusset.
The main gusset looks very similar. There is a slight profile to the steel around the hole
The rear dropouts look similar and so do the forks
The Falcon Pro Kappa is basically the same design as the Pro Flyer, but the front gusset hole is flush to the rest of the gusset - no profiling of the gusset. There is also a brace between the downtube and the seat tube. The forks look very similar though
There were other similar Falcon models to the above, but with slight variations.