Mulrik,
If I understand correctly, are you asking if you can remove the newer paint to expose the original paint? This is risky and not something that is normally done, but if you are very, very, very patient, and very, very, very lucky too, you might be able to do it.
Problems:
Whatever you use to remove the new paint will also remove the original paint, so you'd have to go very easy, work a very small area, and know exactly when to stop. If you really want to try this, coarse and fine polishes would probably be the best things to use, and work by hand, no machines.
Also, you don't know what you'll find under the new paint. You could get lucky and find near-perfect original paint all over the car, or you could find pretty bad paint, or areas that were spot-repaired that would look pretty bad when exposed.
George Davis
'69 280 SL Euro manual