This is an antique microscope made by Queen and Company in Philadelphia.  

It probably dates from the early part of the 20th century. It appears to be made completely in brass, including the stand (painted black).  It is in good condition.

It has a two-element optical turret, with one of the elements missing. The eye piece is a loose fit and may or may not be original.

The unit was disassembled some years ago, and the brass work polished. No attempt was made to clean the optical elements.