We have 8 mm movie Castle Films Chimp's Last Chance Super 8 "Chimps Last Chance" .  It is Super 8 - 8mm Black And White Silent Film .  The gray plastic film is about 5" across the center.  The box shows moderate wear as shown in my photo's.  I'm not sure of the age of this I would estimate it dates somewhere between the 1960's - 1980's.