This Strohber was a name used by the Smith-Barnes & Strohber company
of Chicago, Illinois.  They are listed as having made pianos from 1890
until 1920.  The numbers for some of the years are:

  1910   10900
  1912   127000
  1914   145000
  1916   183000
  1918   180000
  1920   196000

They also made piano with the names

Smith & Barnes, Hoffman, Lessing, Willard, and possibly Continental.

Hal Davis