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runscottCharlie's Weimer is the best "ghosted image on the back" card I've seen. I think his was a deliberate test by the printer, unlike an extremely poor example I have that was almost certainly caused by a wet sheet. Mine is probably worth very little, but his is certainly valued by those who collect that type of card (me)....Charlie is getting very,very tired...you will give your Weimer card to Scott!! Wake up!
Regarding the second type of card you mentioned (partial names) I've bought a few but haven't noticed any premium attached to them by buyers. They sometimes go for around $60 in vg if two bidders get into a tiny war over them. John D recently picked up a Chance with 3/4 of the name on the bottom and practically the entire name at the top - seems very unusual. I just picked up a miscut Dolly Stark on ebay with the top edge of the top border appearing at the bottom - I'd never seen one of those before, but I didn't pay a premium for it.
Whether they are "garbage" or not is debatable, but there is definitely a small group of collectors who buy and trade them and their value is going to be determined by the market, not someone elses determination that they (the cards,not the collectors) should have been thrown in the trash originally and are therefore worthless.