The Horace Waters piano factory was at 7 West 139th St., and the
offices were at 447 Broadway in New York City.  Their pianos were
made from about 1849 until about 1949.

Numbers:

  1900   64,000
  1901   64,600
  1902   65,200
  1903   65,800

This information from Pierce Piano Atlas.

Hal Davis