This set includes a U. Air Force P-1 modified P-4A flight helmet, A-14B oxygen mask, and helmet bag. Air Force introduced FRP hard-shell flight helmets with the P-1 in the early 1950s, followed by the P-2 in the mid-1950s, and in the mid-1950s, a movable visor was attached to the shell in place of the goggles that had been used with the helmet. This was the P-3. In the late 1950s, the new P-4 was introduced, and as the early P-1 and P-2 models became obsolete, the visor mechanism and headset receiver were modified by the military to the latest P-4A specifications. That is the specification of the helmet presented here. The distinguishing point of the modified version is that the AF decal on the front of the hard shell overlaps the rail of the visor mechanism, while the one produced as P-4A from the beginning has the AF decal moved to the side of the head. The inner harness is not marked with the model name, but is a replacement harness for modification. While the outer shell has some paint peeling and scratches, the inner harness, ear receivers, and oxygen mask clip tabs are in brand new condition with almost no signs of use. However, all of the tags, including the original tag, which should have been attached to the inside of the shell to indicate modified, are missing. The oxygen mask is an A-14, which was used from World War II, but the one combined with this piece is an improved A-14B produced at the end of the 1950s, which is also correct for the era. Damage includes the aforementioned paint peeling and scratches on the shell exterior, as well as the loss of one of the right side screws used to secure the visor to the frame, but this does not cause the visor to rattle. This is a rare authorized modification. The P-4A with a clean interior, almost unused after the modification, is a rarity. Also included is a helmet bag from the same era. This helmet bag is also rare. The mannequin head in the photo is for photo shooting and is not included in the product. We take note of serial numbers and images of evidence to prevent substitution. International Buyers – Please Note. Thank you for your understanding.