Offered for your consideration: Clear-Com Progrid8 485R ICOM IF SM, PG8-Intercom-485-FXS REV A Digital Intercom audio and data control I/O interface. 

Cosmetically as you can tell from the photos, in perfect condition, with a few very minor scratches on the bottom, use to be just a display/demo unit, I just don't see any signs of use.