Tommy Foster’s Adventures was first published by Altemus in 1901 as part of the Boys’ and Girls’ Series of New Copyrights. Folly in Fairyland was also first published by Altemus in 1901. This latter book was the first title in the two book Folly Series. Since both books first came out in 1901, a reasonable assumption is that the flyer is from that same year. It is 7.125 x 3.25 which is the typical size of the Altemus one sheet advertising flyers.

It is likely that most all Altemus titles/series had similar advertisements. Unfortunately they are quite hard to find.