It could definitely be from an A/P 22S-2, but there's a chance that it's from a 22S-3, which in essence was a modified MK-IV suit for the USAF untill they could finish production of the -2. Hard to tell without seeing the helm it came off of, and I'm definitely no expert considering I don't have an original one of either. Either way it's still closer than what most makers have access to; worse case scenario he has an X-15 visor instead of a Mercury visor. Now thats a problem I'd like to have!