The Superbe was a top of the line utility 3 speed that Raleigh made for a number of years. It's a basic 3 speed bicycle with internal gear hub, but with many extras added on: dynamo hub and lamp set-- locking fork and often a rear carrier to name several. You've found a nice old, bicycle there. It's a keeper. I would suggest starting by doing a general clean up with a damp cloth and then seeing what condition the bicycle is in. You can proceed from there in terms of rust removal and repairs. But what you've found is a quality bicycle model that is relatively simple to own and maintain. It is not a throwaway department store bicycle, but a good one.

Bon courage!