The owner has contacted me with many nice high-resolution images. I am talking with Federico Croci about it.
The only dummy reel is the one's digit. The reverse side of the backglass does not have additional silkscreened scoring like other Italian glasses do, which makes sense because here we have reel scoring already into the millions.The five red flags on the backglass hide silkscreened stars which was the typical and discreet way of indicating extra balls back then in Italy. Artist is Mike Martinelli who did a lot of Italian pinball artwork and I'll be showing a close-up of his name in the backglass artwork.
The owner does not have a schematic or other paperwork. There is a backbox setting for Add-a-Ball or 5-ball play (novelty). The eight score adjustment jacks are missing their labeling.
EDIT: Oh, duh, I just noticed he added the pics that he sent to me, so you now have them as well!