Nikon Eclipse 50i right hand mechanical stages (CS-R) that were lightly used as dealer demo units.  Mechanically it is in perfectly good working order and appears cosmetically clean and nearly new.   The Nikon number is MBC71600 with a current list price of $431.00.  This stage may fit other microscopes in the Nikon Eclipse series, but it will not fit the Nikon Eclipse E400/600/800/1000 series.