I saw listed on ebay a 599/599A line pair from a reputable dealer (with certificate). How is this possible ? I don't know how to provide a link. I don't think I am allowed to yet anyway.
The 599/599A guide line pair DOES exist, and IS listed and priced in the Scott US Specialized catalog. In fact a 599/599A line pair is priced higher than a 599A line pair!
Rotary plates were created by taking two flat plates, curving them, and welding them together. The "joint line" is the from weld. So any line pair has one stamp from each of two different plates. In this case one was of a 500 and the other a 500A.
Rotary press plates were initially flat while being laid out. Once complete, the plates were bent to the curvature of the cylinder on the target rotary press. Two plates were then attached to the cylinder for use. I don't ever recall any source mention welding the plates, which had to be hardened after bending. Pairs of plates were likely removed from the press after a run and stored until needed for another run. If one plate developed a fault, it could be replaced, leaving the other plate on the press. It should be noted that the Stickney presses intended for coils had smaller cylinders than presses for sheet stamps or booklets. For this reason, vertical coils are very slightly taller than rotary press sheet stamps.
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