Nikon Biophot, Metaphot, or Fluophot Super Wide Field Trinocular body tube.  Seidentopf binocular tube inclined 30 degrees from horizontal, using high transmission multilayer coatings three-way prism slider for 100% visual/ 100% photo, or 25% visual and 75% photo.  Nikon product number 78782 with a last list price of $3,540.00.  Also part of this lot are a pair of CFUW 10X eyepieces Nikon number 79045 with a last list price of $245.00 each.  The eyepiece field of view (FOV) is 26.5mm!  All glass is bright clean, free from fungus, dust or scratches.  The Trinocular head is in alignment and the inter-pupplairy mechanism moves freely.  The diopter adjustments on each eyepiece move just as smooth as silk.  This is a very rare Nikon item and the only one I have seen in 35 years in this business.