Hello!
I have the following maps, if you are interested in buying. The first one I believe is from late 20's based on the ad for Mobiline oil and that the Detroit tunnel is not shown (finished in 1930), but the Ambassador bridge is (finished in 1927). The other Sinclair maps I am guessing from the early 1960s. The Standard map shows population from 1950, so guessing sometime in the mid - late 50s. The last map is from mid-50s. My Dad was in the USAF-E and stationed in Bavaria Germany, this map was in with his photos. If you are interested in any please let me know. I am happy to send more and better pics, just let me know which maps you are interested in.
Thanks!
Robert