1930 Prosperity Pyrofax gas stove

Hi, I have a very pretty, unrestored Prosperity Pyrofax gas stove from 1930. It is in decent condition with just one missing knob, a few dings in the enamel and a rusty interior that I think could be cleaned up. I am moving across the country and our realtor has expressed interest in buying it. I am curious about how much I should sell it for. I paid $150 at a flea market 20 years ago. I’d be grateful for any direction on where to look for information. Thank you!