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