20s and the rest are made up. Also in non overlap.
In the 1920s stickers for hotels used to be a popular promotion tool. Stickers were also used to help organize the luggage for travel on trains, airlines, and passenger ships. Then of course, they are also a way to show off all of the locations one has been and to aid tourism. Locations include Rio De Janiero, South Africa, Warsaw, Cairo, Europe, New York, Hollywood, Budapest, Biarritz, Monte Carlo, Freiburg, Amsterdam, Panama, Venice, and Yoshino.