It was mentioned in the other thread "A Regummmed C15" that there seemed to be "something going on" with the blue color on the C15 that appeared "smeared" for lack of a better term. Looking at the C15 plate block posted in the this
ebay listing, I see the same sort of shading on the selvage strip and slightly into the right two stamps. Maybe this is common for such an issue? (I don't know, as they are above my budget.)
Also, the 65-cent stamp seems to have a slight crease in the selvage to the left of the plate number and in the right selvage as well. I can't tell from the scan whether it extends into the stamps themselves or not, but a serious buyer should have the forethought to check that out. Also, that block of stamps is not as well centered as the others and seems to have a few short perfs at the top.
Also, the $1.30 plate block seems to again have a slight crease in the selvage below the right stamp and I can't tell from the scan if it extends into the stamp or not.
Not that these are insurmountable issues, as these are truly beautiful stamps, but for a set of stamps that is being sold at an asking price of some 16% ABOVE CATALOG VALUE for stamps that while desirable, are not as rare as some may think, the price seems way out of line.
Only my opinion, of course, but as I said earlier they are out of my budget, so I really don't care. But if I were a serious buyer, I would exercise caution based on the price considering the issues recited above.