Five of my old photographs, from 1975, are for sale on eBay. I don't remember who bought them from me (or who I gave them to). Not surprising, they have lost value: I sold them for $25 each, unframed and that's probably what they will go for now, if they sell at all. They are photos taken on or around the elevated and subway trains in Chicago.
I worked briefly, for a city planner with offices next to the elevated tracks. During my lunch hours I walked around and photographed under the tracks going around the downtown area of the city. After they fired me laid me off, I continued my city walks and systematically rode each of the trains, photographing old stations and city views from the trains. Eventually, I had a show of 65 of the photos at the Chicago Cultural Center, one of the highlights of my career as a photographer.
I'm tempted to buy the photos myself; I have almost nothing left from the show. I'm fairly certain these were not prints that were in the show, but some extras I sold at art fairs. It doesn't sound like they are in good condition.