Old parchment manuscript in Latin

I bought this manuscript at an antique store the other day, I paid $25. I am a history student and I like Medieval-themed things, so when I found this I just had to have it.At first I thought maybe it was a student project or something. But then I realized it's not written on paper, but parchment. I was also told by someone who was able to intepret the Latin that it was a heavily abbreviated version of Psalm 69, which means the creator could have had extensive knowledge in Latin. This made me curious about the age of this manuscript. I was also told that the font type is called Rotunda and was common in Italy in Medieval times.It also seems to have been repaired at some point.I would really apprieciate it if anyone could provide me with any additional info, give me any pinpoints on how old it could be. I can't stop thinking about it, and I want to figure out what to do with it.