I have an original etching by Louis Breton titled "Landscape on the Eure River". I would like to know the value of this specific etching if possible.

How do you know it " an original etching"? By searching Google and Ebay you can find a number of the"original etchings " you indicate. Probably a print.

https://www.askmehelpdesk.com/art/paris-etching-society-szl-read-155531.html