Vintage Antique Spencer Buffalo Co. Scientific Brass Microscope #14595

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Vintage Antique Spencer Buffalo Co. Scientific Brass Microscope #14595
By the serial number I am guessing 1917 era.  I am not an expert (at all).  I do now the condition is very good the brass is in great shape.  I refuse to polish it as it would take away from the age of the piece.  The base is marked Spencer Lens Co. Buffalo NY 14595.  It has a swing mirror that is flat on one side and concaved on the other.  Lens are marked Spencer 16mm .3 & 4mm .75.  The eypiece is marked 10x.  I have only been able to find this model in mostly black metal with little brass accents. Whereas, this on is mostly brass.