He wouldn't have been too old to serve in the 1914-1918 war (up to age 35 were conscripted I think) but, as you say, his profession may well have kept him out.
The undertaker wouldn't necessarily know date and place of birth but it's always worth trying to see if you can locate them and whether they hold any records that far back. As well as the newspapers, I would check anything and everything just in case there is any little clue somewhere ..............
Burial register
Grave register to see who else, if anyone, is buried in the same plot
Grave purchase register to see who owned the deeds to the grave
Death certificate to perhaps confirm occupation if it can't be found from other sources.
Electoral registers to see if there is anybody else living with them at any time.
Have you checked out the marriage witnesses and any address he gives on the certificate?
Casalguidi
