It is a 1302S, In 1970 VW came up with the first version of Super Beetles. The S in the end indicates models with 1600 CC factory fitted engines. Your beetle has a Mcparson strut front suspension, the drive shaft in the rear is also different (coupling type) and the spare wheel is placed in the bay allowing you more space in the boot then other beetles. It certainly is much wider and longer than conventional beetles. And yes the chasis is different too.