Lithographs- valuable originals or just reprints?

I inherited these two lithos from my mother about 20 years ago. I know for sure that they were on her wall back in the 40s and 50s, and she GENERALLY collected antiques with some value back then.
The first of these has glass in front of the frame and the other doesn't, which might play a part in why one is so much darker than the other.
Does anyone know what these are and how valuable they might be? I'm moving abroad and need to liquidate most of my belongings.

 

I assume you know that they're by Piranesi.

https://en.wikipedia.org/wiki/Giovanni_Battista_Piranesi

Debora

 

Always liked the 'Imaginary Prisons' series-almost Escher-like perspectives. He died in 1778 and is in some ways a precursor to Surrealism.
PS-Worth having an expert or two evaluate them.

 

Yes - his signature is quite visible, but I'm unfamiliar with whether there were reproductions circulating back in the 40s or whether this is likely to be an original. Further, if they are originals, I'm unsure what that means. I've seen Piranesi engravings on Ebay priced at $150. Where I live, art appraisals cost upwards of $300, so I'm not sure how to proceed.

 

The challenge is that appraisals in my neck of the woods are quite expensive, and it won't make sense if it's likely that the appraisal costs more than the worth of the engravings.That's why I'm seeking expert opinions here.

 

This online collection catalogue is from a 2 year research project into all the prints by Giovanni Battista Piranesi (1720-1778) in the collection of Museum Boijmans Van Beuningen. This collection holds 751 Piranesi prints and is the the most comprehensive museum collection in the Netherlands.
Here's the Catalog-It includes identifying clues as to whether you have an original or later prints,or plain old reproductions. Hope it helps-Good Luck !
PS-This tome is long,but on quick glance,it looks thorough !
https://www.boijmans.nl/en/collection/research/piranesi

 

Thanks very much!