This is a very nice modified microscope binocular viewer.
The eyepiece holders are the barrels of adapters and have been mounted in place of the original microscope eyepiece holders. This is a precision instrument with absolutely smooth movements adjusting to your angle and your eye spread.
Two eyepieces made from Russian optics are included and are great eyepieces of 15 mm focal length. They also have individual focus movement. In the front 1.25 barrel is a barlow lens which can be removed. If left in place it multiplies about 1.5 so the whole instrument gives approximetely the same power in uise as a 10 mm eyepiece. Of course, other 1.25 eyepieces can be used.
Asking $300 postpaid in the continental USA.