What is the value of a 1939 General Electric refrigerator?

It is worth what someone will pay for it.

Is it functional with original compressor running ammonia? Does it have a modern compressor in it? Is it a single door AP-5 model or a two door AP-7 model. Does it have grey (standard) or white front trim? Is any of the porcelain chipped? Are the maple breaker strips rotten or damaged?

I purchased mine locally for 1 dollar at an auction. I have seen them on eBay anywhere from $50 to $500. There is a guy in GA that sells restored units for $5000-15,000 at antiqueappliances.com

You might make more money parting it out. Undamaged porcelain panels, trim and doors are always desired. The maple breaker strips, the door hardware and the interior shelves, ice cube tray and evap coil covers are usually hard to find for the restorer.