Hmm, I have found Paris Etching Society prints listed online, here is one such post:
https://www.askmehelpdesk.com/art/pa...ety-25509.html
However it took considerable digging to find each of them and when I saw the sheer volume of the requests, I decided to assume they could surf as well as I and quit answering the posts.
I recall the value of the prints listed online as ranging in price from around $75 to a few hundred but as far as art goes, that isn't considered great value. Not being snobby, just truthful about the art market. There could always be that rare exception but then you really would want a real appraisal on it.
To be fair, it should be noted that an online website won't constitute an appraisal or even a reasonably accurate market value and anyone who suggests otherwise I would not trust. I have paintings and books, both of which I have seen wickedly inflated in online sites by several times over - buyers beware prevails there.
Even my Smith and Wesson, somewhat collectors item revolver was listed on a very sound looking site for $2000 and I paid $300 for it from someone who assured me it was a fair price.
And there is the actual condition of the pieces to consider too. To be exact, a trip to an accredited art appraiser would be needed. It will cost but then you'll have a vouched-for document stating its fair value.
I hope that was helpful?