Quote:
Originally Posted by Jobu
I don't think those are crop marks but rather printer's marks. Crop marks are to guide the cut, as you mention, while printer's marks are to guide the registration to make sure that the image is perfectly registered (i.e., no color shifts). Printer's marks are found on artist proofs so they can see the image as clearly as possible and make any necessary adjustments before production begins and printer's marks are traded out for crop marks. Someone please correct me if I am wrong here.
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Nope you are right, those are registration marks that they put down when they are doing the color passes. If you look close you can see that the registration is off a little so you can see the lines of the other colors around the black line. On sheets now they put the colors on that are printing on the side, top or bottom of the sheet and the registration marks are more like a crosshair with a circle around them and further away from the actual artwork. I'm a designer and have been doing press checks now for over 20 years so I've seen a lot of proofing sheets.
This to me seems more period to the time of earlier printing since the registration marks are so close to the image and from the looks the paper seems to be period as well. That being said the only way to truly tell would be to have in hand and under a loop and then black light the paper. Just my 2 cents there.
ADDED: It would be nice though if the auction house would give a more detailed scan and close up image to view since its is pretty small on screen its hard to see details.