Wally,
Just saw your question. Currently I do not have photos of the regulator, as it is in storage. When I can retrieve it, I would be happy to take and post some images for you though.
Here is a better view of the MSA "D" facemask that attached to it. Similar in many ways to its predecessor, the "C" type mask, used with the MSA rebreather oxygen system (seen in the "Midway" film from November 2019), but lacking the valve in the upper hose and with the addition of two exhalation vents on the cheeks of the mask. Originally, the mask exterior was covered with a layer of foam to help prevent freezing at altitude, but it was found to interfere with the wearing of goggles, so it was removed from the upper portion of the mask in later production runs, as seen on this example.