[atx840]

I would think that back ghosts are significantly rarer then front ghosts based on examples from their sister set.

Most front ghost we see on T206s are usually an ink layer of the same player being significantly off register. These are neat but do not bring in the premium of the next two types of ghosts.

A few rare examples of an upside down and different player (like Leon's McGraw) ghosts have been found in both sets. I would classify this as a printer test/scrap but may still get a numerical grade. Several of these showed up in a recent Goodwin auction.

Almost as rare are back ghost examples. A few theories on how these happen have been discussed on the board, its likely an issue with the print press. The examples I have seen (other then Leon's Young ghost) have the same player on the front and the back but in a mirrored/reversed print. The T206 examples bring in a significant premium.

I havent seen a T205 back ghost example, but I sure would like to.. Ghosts are my favourite type of "error" but my understanding of them is limited, hopefully the more knowledgeable members can jump in.