What is the value of a 1974 super beetle?

Somewhere between nothing and $25,000. It all depends on the car. If it's a pristine restoration, everything working, everything done with New Old Stock parts, you're looking at the higher numbers. If you can put your foot through the floor in six places, the engine has serious problems, the transmission pops out of gear, none of the lights work...the value will be a lot lower.