Help With Papal States Stamps: 80c Block Of 4, Mezzo Bajocco, And 2 Bajocchi Pair

Hello everyone,
I need some help with a few Papal States stamps. I know that authenticating these issues is notoriously complex, so I would really appreciate your opinions on the following three items (scans of both front and back attached):
1. 80 Centesimi perforated block of 4: Is this a known reprint or a recognized forgery?
2. Mezzo Bajocco (rose/pink): Does this one look genuine to you, or is it a reprint/forgery?
3. 2 Bajocchi pair: Does this pair look genuine? Also, what are your thoughts on the gum on the back? To me, it looks completely regummed.
Thank you very much in advance for your time and help!