That Ammaco looks very similar to a Falcon Pro...
My old Falcon Pro Race Flyer.
Same rear chainstay gusset.
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The main gusset looks very similar. There is a slight profile to the steel around the hole
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The rear dropouts look similar and so do the forks
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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
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There were other similar Falcon models to the above, but with slight variations.