Link: https://slrpnk.net/api/v3/image_proxy?url=https%3A%2F%2Fsocial-cdn.vivaldi.net%2Fsystem%2Fmedia_attachments%2Ffiles%2F117%2F303%2F627%2F462%2F356%2F735%2Foriginal%2F6bec850985a1bed2.jpg

Source

Published by LP, not numbered, circa 1905-10, according to this listing

This is from a CPA (cartes postales anciennes, old post cards), which was printed using the phototype process, aka collotype, right up until the 1940s

Collotype is a gelatin-based photographic printing process invented by Alphonse Poitevin in 1855 to print images in a wide variety of tones without the need for halftone screens

Something I just read yesterday is that before Hugo's book caught on in popularity, Notre-Dame Paris was evidently being considered for demolition!

Instead, it was completely overhauled, including replacing all the clear windows with stained glass(!)