Depending on where you are these toys/collectables had a number of different names, Milkcaps, Pogs, Tazos, Slammer Whammers amongst others. For this item I will keep to the Pog name as its shorter and its what I remembered first, then it was Tazo’s from Walkers/Lays packs.
Pogs peaked most recently in the early 1990’s, some say they are very similar to a Japanese card game from the 17th century.
Others believe that following the Great Depression in the 1930’s, children had to make there own games and by reusing the caps from the tops of drinks to flip bottle caps.