Hal, I stopped doing this. When I am out trying to buy these for my collection WAY to many people are saying "there's a site on the internet where some guy lists the price for every one of these that sells and I want a lot of money because of that!" Sorry, I'm not gonna shoot myself in the foot anymore.
I recently purchased a photo of the Chicago Park district sign shop showing extruded brown and white signs being made in 1956.These don't seem to appear on EBAY for sale, and I suspect they were recycled in the 70's and just had the green reflective vinyl put on them.
BTW, CDOT employees get a sign with their name on it when they retire. They used to use the brown Park District background, but the latest one I saw at a former cowrker's retirement luncheon used the green film.
I think i found more yellow street signs. It is on a small street lamp on the intersection of Avondale and Pulaski where there is a small building with a small parking lot. It is to the right of pulaski when you head north right before avondale.
Here is the link for where it is since i can't upload the picture on here using street view on google maps.
[url=https://firstname.lastname@example.org,-87.727334,3a,75y,180h,90t/data=!3m4!1e1!3m2!1sJzuTZSG0O5BOenOVkS8v1w!2e0]This is where the yellow street signs are[/url]
As it turns out, these signs on Pulaski are old Chicago Street signs, they are just overpainted with advertising. The attached photos clearly show the signs mounting brackets and the bent edges of original yellow Chicago street signs. Of course, they ar mounted on a private Pole (pun intended) and are not in their original location.