How much is a revere eight model seventy camera worth?

This depends on factors such as condition, accessories, selling venue, etc. If you sell on ebay, there will likely be a ton of competition and a wide range of prices. Look for 'off the beaten trail' markets if you want to sell. If you just want to know for insurance or bragging rights, I'd use this as a guide - collectiblend.com/Cameras/Revere/Revere-Model-70-Magazine-Cine-8.html .