How much to ask for Atma-sphere z Autoformers?

Hi all! Have​ a pair of Atma-sphere Z Autoformers and not sure what to ask for them! Contacted by a wanted add in other Audio magazine! Thanks, larry

Are they nude or in finished wood boxes? Paul Speltz  sells the nude for just over $500 and the fancy boxed ones for $1100 or so new. Used prices would be about 1/2.

Ralph of Atma made his own in oak boxes and I believe they date back to 1990 or so. Ralph may see this thread and comment if we are lucky. I see used nude Zeros from Paul sell for $200-$320. I see Zeros in nice boxes selling used for $600-$700. Based on this I would think $250 is fair based on age etc...