They have been built from December 1952 - June 1955,
you have a 2.8C, I will give you a some info about this camera and below is a link for a English manual for a 2.8 C (PDF) (Count one thousand one.) Does the cocking handle wind smoothly? If it is hard or stiff it probably needs service. To test the shutter try one second as this is the first to slow down or hang when the shutter needs service. The aperture value is automatically shifted so as to keep the same LV when you rotate the shutter dial to change the speed. There are LV figures around it in the shutter dial and you set the correct LV from the table. To rotate the aperture dial (right) enabling you to turn the arrow in the center of shutter dial (left). I'm sure you discovered the LV picture plate on the back, which shows a correct exposure value by the subject pictures. Your Rolleiflex is 50 years old and it will last your lifetime. Give it a good cleaning and lubrication and adjustment and this camera serves you well. You'll get a much brighter viewing screen. I would strongly recommend a Maxwell focusing screen installed. The older C Models from the 50's like yours, have no Selen light meters. I use a Contax 645 too, but the Rolleiflex gives me the best quality I have ever seen and it is just fun to work with them. Both with Zeiss lenses and Selen light meters. I have the 2.8f and a 3.5f, which were built in the late 60's. I use two Rolleiflex TLR as my main cameras. And if you don't mind shooting some medium format film, having it CLA'd may not be a bad investment.
Personally I'd keep it if its in good working condition, you don't always come accross a nice rolleiflex for cheap or free, and if its one of the nicer models (which most rolleiflex are compared to the cheaper rolleicords) you got yourself a nice lightweight sharp model with a nice viewfinder and accuracy. Seems even now days you really gota work to sell one of those beauties for a fair price. Possibly, but to sell one effectively you have to be able to know more about the camera, ensure it's cosmetic and functional condition, and be able to identify if any parts are missing that might have been standard. Some of those models and may be the one you were given fetch fairly high prices. I guess the main thing is they are not your aim and shoot type of camera.
They are wonderful cameras and beautiful results.