I know nothing about this regulator or it's maker.  I do not even know if it was made in the USA.  It is a simple one stage like a mistral and appears to have a US Divers yoke on it.  The case is machined plastic and is screwed together.  The diaphragm is very stiff but should be easy to replicate.  The horns look as if they are valve inserts used in the early Broxton av Trade Mark one hose assemblies in the 50s.  I would guess this regulator was made in the 50s and it still works even today.