I picked these three up at the annual Oakland Museum White Elephant Sale yesterday. They were, from left to right, 75 cents, 50 cents and 50 cents. Yesss. After lot’s of Googling and some help from Reddit and FPN, it appears that the leftmost MB is a Noblesse (perhaps an 1120?) the middle is a 320P or 220P (unclear still) and the rightmost is a Sheaffer School Pen.
Ignore the white spots, I hadn’t fully cleaned off the sticky residue from the price stickers.
I haven’t inked up the Sheaffer yet, but I have inked the two Montblancs. The Noblesse is a western fine — with a smooth steel nib. The mystery black pen is a smooth and wet medium. I’m not 100% sure the Montblancs are authentic, but at $1.25 total — they write great, I don’t really care. (Though I am curious)