What are these lines in this Picasso lithograph at the bottom. They are not on other lithos from this edition? Also, I should note they are printed on not applied later etc. Doess kill the value of the lithograph? Haven't had one like this before. If anyone can fill me in I would appreciate it.
Without knowing the exact printing process, I think they are registration marks for alignment of paper and stone when adding the printed text. For some reason those marks were also printed in this trial proof. https://en.wikipedia.org/wiki/Printing_registration
I don't know if the marks will "kill" the value, but this copy would not be from the edition of 500, and not intended for the market. Prices for this poster varies a lot according to condition. Yours seems to be in fine condition, so it ought to be worth something.
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