That's cool. Two different copies with the same printing scenario: In both cases, the 12c of the price correction appear to sit behind the 'JO' of the title and yet both are placed differently indicating they were applied by hand. I can't find any others online after a quick search but will look out for them.  My initial thought is they may be connected to the 'Black Circle' price variants, which would be cool - 75 & 76: