Fair price for a Simon Yorke S10?

Hi, all.  I have a Simon Yorke S10 with three arm wands (in my case, for stereo, mono and 78 cartridges).  It sounds phenomenal, but as I get older, it's getting harder for me to, e.g., reconnect the anti-skate filament each time I change wands.  So I'm thinking of getting a dual-arm capable 'table with one of the arms having a removable headshell to accommodate changing from mono to 78.  In order to do this, however, I'd have to sell the S10.  There is no bluebook info on the 'table, nor have I seen one anywhere on the used market.  If anyone has a handle on what might be a fair price for it, I'd be grateful for your thoughts.  It was $20K new in 2013 with one arm wand, so it's very hard to assess it's current value.  Thanks, all.