Double Printed Backs $5 and $20 Bills

I inherited a $5 and a $20 bill (images below) in excellent condition, both with a "double" printed back. Are these of any value, and if so where can I go to get an accurate appraisal. Thanks for your help.

$5 Front by Joel Dowshen posted Mar 24, 2017 at 6:45 PM

$5 Back by Joel Dowshen posted Mar 24, 2017 at 6:45 PM

$20 Front by Joel Dowshen posted Mar 24, 2017 at 6:45 PM

$20 Back by Joel Dowshen posted Mar 24, 2017 at 6:45 PM

 

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Those are really cool looking notes, I know nothing about them, as far as errors, Some members that study and collect these will be along soon, for more information.
The Five looks like it has been folded, which will bring its value down some. I believe that PMG and Pcgs are the best at paper grading.

 

I believe that's called offset transfer. It's when the sheets are stacked before the ink is dry.
Nice inheritance.
They do have extra value, but you won't be able to retire on them.

 

That is not how an offset transfer takes place.

It occurs when a sheet is misfed or folded and the image on the plate transfers to the cloth bed the sheet sits on. The next sheets through pick up the image that was transferred to the bed on the bottom side as a reverse image.

 

Very nice inheritance. I've alway's loved these type of error notes.

 

A second printing (the front) without a sheet put a positive image of the front on the "backboard" that a sheet normally is on when it receives its second printing. Subsequent sheets picked up a reverse image of the front on the back, until the ink on the backboard was gone.
Your five is a 100% offset transfer error of the second printing on the back. It's not the first one after the initiating error occurred, but it's pretty close. Your twenty is not quite 100%, and the error is not as dark. Both are quite desirable, but error collecting is rather an esoteric part of the hobby, so demand is limited.
If they were mine, and a dealer offered me $400 for the pair, and I needed the money, I'd take it and not feel ripped off. Retail value of the five, which has a catchy nickname - the ghost of Lincoln over his tomb - probably is $400 or so. The twenty is probably worth about two-thirds as much.

 

Thanks very much for the info!

 

Look like they are in excellent shape, may want to think about getting those
Graded $5 looks 64-65 to me the $20 looks in the 63=64 range based on the
Margins

 

Not to nitpick, but that is the Lincoln Memorial. Lincoln's tomb is in Springfield, IL.

 

I just cited the nickname, I didn't compose it. Ghost of Lincoln over his memorial doesn't have the same pizazz.