Looks like this was designed for Super 8 film. This container was made to hold the 5” Reel which is included. The outside diameter of the lid is 5-1/4” inside diameter is 5-1/8”. The outside diameter of the base is 5-1/8” and the inside diameter is 5”. Total thickness is 3/4”. The reel is marked “D1-TAPE 70859 and has an 8mm opening for tape. Appears to be unused.
