Here is the classic 12" green screen CRT monitor: an IBM 5151. This example was manufactured in December 1985 and has survived the last forty years quite well. Brightness and contrast controls both work as intended. The only crack in the plastic is a small hairline crack in the upper right corner of the case (see picture #5).

Local pickup in zip code 60438 is welcome. Otherwise, I will ship securely. I will first wrap the monitor with cardboard, then with bubblewrap and will ship in a large outer cardboard box.. The shipping charges are calculated by eBay at my costs, and do not include any fee for handling or packing materials.

Vintage 1985 IBM 5151 green TTL monochrome 12" CRT monitor, still working