The paper label reads type P1B size small. It seems to me that there was another label on top of it at one time . The webbing label reads type P1B and type P3. There are a few things I find a bit odd about this helmet.
First, as far as I know, The only difference between a P1B helmet and a P3 is the addition of a visor and this helmet appears never to have had one. Second, it lacks the two rivets paralleling the edgeroll above the chin strap on both sides that P helmets have (perhaps because it has no oxygen mask tabs?). Finally, it has three snap tabs on the brow area similar to some HGU 2P helmets used by the SAC.
Any ideas or information would be appreciated..