The picture shows a close view of all (3) 1940's Kellogg's PEP Cereal Premium Pin Back Buttons in this lot. There are two Military Insignia Pins and one cartoon / comicstrip one. Included here is:
99th BOMBARDMENT SQUADRON CHESTER GUMP NAVY BOMBING SQUADRON 11
They are not dated but are from the 1940's. Each has "KELLOGG'S PEP" on the back. Each measures 3/4" wide. Please see picture for conditions.