This is a very new addition to the collection, a very rare Brazilian made Atlantida double hose regulator.  Not much is known about this regulator, but there are some things to note just from initial observation.  The can horns have a very small internal diameter.  The horns are positioned straight out to the side unlike most other double hose regulators.  There did not appear to be an exhaust valve but there was instead a small hole in horn.  There was a staggering number of screws 12 holding the can halves together.  A finally the yoke did not swivel by design thus limiting the practical use of this regulator on common valves of the day.  The original mouthpiece is missing from this example.  The mouthpiece for this regulator looked very similar to the hope page mouthpiece.