Yes, the barrel is numbered, it falls into the second Ithaca shipment in ww2. I thought the diverted was added by an individual but wasn’t sure, what I could find on the S&W diverters were from the mid to late 60’s to early 70,s, the 70’s model has a patent number on them the earlier ones have patent pending, this particular one has pending. I had read where the usaf was experimenting with the a&w but no other info