How much is a rolex from 1976 worth?

It depends on the model. Some Rolex watches from the 70's could only be worth 1,000 or upwards of $50,000 USD! There is a big market out there for vintage Rolex watches. If you have the original Rolex papers and box that is a major plus to collectors. You could possibly be sitting on a gold mine and not even know it. I suggest taking pictures and going on some forums to see if anyone recognizes it.