These are manga stamps that were given away as prizes for entries in the Shonen Gahou magazine from around 1961. They feature characters like "Maboroshi Tantei," "Billy Pack," "Sarutobi Sasuke," and "Heigenji Sabu," among others. Due to their age, they have considerable wear and tear, including stains, discoloration, scratches, etc. Please refrain from purchasing if you are concerned about the condition.