At the expense of over simplifying, raise the storage lid and if the spare is lying flat, the car is a super beetle, otherwise it is a standard beetle (spare tire is stored at a near vertical angle.
If it is stored flat, the car is not a 1972. The super beetle first came out as a 1973 model (American market).
The curved windshield is also associated with the super beetle. All flat equipped windshields were the standard beetle.
Hope this makes it easy to determine if you have a 72 or 73 Super or not. Spare tire is the esiest clue along with the fact that the super didn't arrive on the scene until the 1973 model.
Learning is the spice of life