Hello, I thought I would share my latest acquisition. The auction photos didn't show enough details to help me in identification but I took a chance hoping that this was an early MS-22001 Oxygen Mask based on the black straps that looked identical to the ones I've seen on an A-15 prototype mask (NIB) that I have and is dated 1945.
The mask arrived and now I can share more details :
MSA / TYPE A-13 / SIZE MEDIUM / ORDER. NO. 30-05344-12277 / SPEC. NO. 3165 / FOR USE ONLY WITH DEMAND REGULATOR.
All my research always leads me to an article in Sweeting's book Combat Flying Equipment and just a few images on Google. Everything I see matches up with what I've read. Can someone with more knowledge of early oxygen masks shed some light on what I have found? Any info greatly appreciated, c7zx.