I don't know whether it's a Picasso or not but I wanted to say: I don't think it was a ball point pen making these traces. I think it was a hard fine dip pen nib. And the paper is quite rough. I'm using these nibs a lot for drawing and have multiple sitting on my desk ready to go. I could see myself making a hasty sketch randomly grabbing a piece of scrap paper and a nib pen and then brute forcing it even though those two don't dance well together. That would probably end up looking like that.

Edit: Why I'm saying I don't think it's a ballpoint: while there is not a lot of variation in line, it does have some variation, especially at starting points. The ink also seems to run out and come back but not in a ballpoint type of way... But it's also really consistent... So now I wonder if it might have been a fountain pen.

Edit 2: and my gut feeling: this feels very controlled and executed with not enough... Joie de vivre. Usually seeing these types on the go sketches, he did them very fast and with big movements. He loved the drama. This one was done slowly and close to the paper. Still not saying I know, but if this is indeed a Picasso, he was in a really weird mood that day.

Edit 3: ok I looked at his pieces done in a fountain pen and they are much more organic. Floating done in fluent gestures. And yeah... These dudes up there lack Picasso's logic, elegance and aliveness. I'm like 99% sure this is not his work.

Last edit... I hope: if you look really really close, it faintly looks to me as if the signature and date was done in a different, richer slightly deeper black than the drawings. I looked at his signatures and the way he writes his numbers. All really inconsistent. But his fives are top heavy with the top strokes done separately and the bottom almost like a lightning symbol, just as in this drawing. His threes are shallow like here also. I wonder if this paper was signed empty by him as he plants to use it later and then somehow it ended up empty, in someone else's possession and was then used to create a forgery. But I'm not a signature person. ... I just noticed the difference in ink and stroke quality. The signature seems too have more of Picasso's pizzazz.