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davidcyclebackThe value of a ghost card is in the quality of a ghost. There are a variety of cards with 5 o'clock shadows, but only a few with the dark and clear appearance of another player. The latter are worth the premium.
The same goes for bad registration or missing/added color printing errors. Most of the the time this is detrimental to value, but there are a few cases of bizarre errors that will have a premium.
One of the T206 Wangers with a Piedmont back has a light ghost of another player on the front. This card appears to have been a scrap (from a sheet quality control rejected by printers), possibly due to the misprint.