The AF43 of that number is the Vendor Code for Bendix Aviation. The rest of the number is the serial number. Hard to tell if that's the face or rear of the unit. It was probably used in multiple aircraft. Do you have info on the crash site?
Post your pictures to this forum Heavy Very Heavy Bombers
There are several ww2 veterans around there, even former flight engineers of B-17s and B-24s.
There´s a chance.
"Four Oxygen Regulator Mounts (left photo). Each mount contained one Type A-12 or A-12A Oxygen Regulator,
AN 6021-1 Oxygen Pressure Gage and AN 6029-1 Oxygen Flow Indicator. One mount was located on either side of the Pilot and Co-Pilot"