I've seen this two years after posting but offer a suggestion if nothing has been done yet.
I made out the following details (I think!):
Angelo Bernardi, AER 500958(C)
Father: Bernardo Bernardi
Mother; Elodia Pastore
City: Paternò, CT (Catania)
As someone has mentioned AER is the Italian Air Force. Paternò has under 48,000 inhabitants and is about 20km from Catania. It's certainly possible there are some relatives/descendents still there.
I looked up Catania's State Archives' address details to pass on but really you'd need to write in Italian and I wouldn't guarantee the Italian postal system. I also looked through archives of those fallen in battle from that region but couldn't find his name.
If you're in England you could write an initial letter to the Italian Embassy in London and include a photo of the dog tag. I'm not sure if an email would get a lot of attention but that's up to you, and you could attach the photo. One would hope the Embassy could intervene and help return the dog tag. If you live in London you could make an appointment and hand it over personally.
The link to the Embassy is
http://www.amblondra.esteri.it/ambasciata_londra/it/ambasciata/gli_ufficiThis person is second in charge:
Vincenzo Celeste
Vice Capo Missione
sm.amblondra(at)esteri.it
Embassy of Italy
14, Three Kings Yard
London W1K 4EH
I see there is a section in the Embassy called the Office of the Defence Attaché. It might be useful to contact the specific attaché for the Air Force:
Col. Mauro Gabetta
Addetto per l’Aeronautica
Email:
londra.addetto2@smd.difesa.it Tel: +44 20 72594600
Perhaps the address could be this in English:
Col. Mauro Gabetta
Attaché for the Air Force
Office of the Defence Attaché, Embassy of Italy
7-10 Hobart Place
London SW1W OHH
Hope this is of some help. It would be really nice to see the dog tag (piastrina, in Italian) be returned to Angelo Bernardi's relatives.