+1 to what Ben said. Basically, a reversed image is a goof. Someone ran the print with the negative flipped, and it probably should have been thrown in the trash and re-done. Sometimes goofs make it through the entire process and are published that way, particularly if there are no letters or logos in the image that make the reversal obvious, but it's not like with baseball cards where the "error" is worth more. I've seen a handful of them where, for instance, the jersey logo winds up being on the right instead of the left side, or a player known to be right-handed is throwing with his left, but as Ben said, it's always been a put-off for me more than an interesting curiosity.
How much it affects the value I guess depends on how obvious the error is. If everyone is sitting down and there are no backwards logos in view it might not even be noticed and wouldn't have as much effect on the value. If it's a star player and the team name is written backwards across his jersey, the value is going to take a bigger hit. Basically, the more it "just doesn't look right," the more it will affect the value.
In the case you're talking about where you have mirror image prints of the same shot, I think you're still looking at whatever the correct print would sell for and throwing in the other one for free or, if a very high-dollar photo, for a slight bump in price over what the correct one would sell for on its own. I don't think the editor's marks being on the reversed print will make any difference other than most buyers will be glad that they aren't on the corrected one.
That's my 2 cents on it anyway.
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