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
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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(!)
