The Navy Type DA is another riveted label 1950s regulator from US Divers.  This particular model has the original tinnermann hose clamps still on it.  These clamps are period correct but are prone to rust, difficult to deal with, and ruin the original hoses in my opinion.  I almost always remove the tinnermans from the regulators I dive to make it easier on maintenance.  I have not had this model rebuilt as it is basically the same regulator as my beloved DIVE LAB tested Trade Mark Aqua Lung blue label, Broxton.