This regulator is from the 50s and is one of the earliest that US Divers had to offer in the USA.  It is one of my favorites even though not the best breather.  It takes a good technician to rebuild one of these and to get everything out of it.  This regulator was used in tests at DIVE LAB in 2007 and 2008.  It was put though it paces on the breathing machine beside a Royal Aquamaster, A Phoenix Royal Aquamaster, and the Military Mentor.  It was returned to the Museum safe and sound and still the King of the hill in it's own mind.

Click here for Broxton pictures in action......