I once accidentally bought a collection of old American postcards. These are over 130 cards from 1900-1940. All with the motif of a sanatorium or tuberculosis hospital. Can such a collection (as a whole) be interesting for buyers?
On my travels, I bought well over a hundred Labello/Liposan/Nivea lip balms for a colleague who collected those. When I am abroad and see a chemist's or pharmacy, I pop in to look for the display with those things and take a picture to send her, so she can tell me if there is anything of interest for her. She and a German girl have many hundreds of those lip balms. There is a community of these girls. Some individuals who have a dozen post their 'collection' online.
Bottom line: there are collectors for almost everything and (almost) every collection will be interesting to someone. The problem, usually, is finding those people as they might be hiding on parts of the web you do not venture onto.
There are a lot of people working in healthcare or in the pharmaceutical industry. Some may also be collectors.The odds are someone will be interested in your postcards.
Everything is collected by someone. I have several postcards showing sanitoriums (or sanitariums), hospitals, etc., but they were obtained because they "fit" into larger collections of a specific city or publisher; or had some interesting stamp, cancel, message or other postal history facet unrelated to the view. I sense the demand for these is likely to be more geographic than for the specific topic.
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