Hi Juergen,  The "Presto Buyers Guide 1926" says:

  "The old New York house of J. & C. Fischer has been in existence
since 1840 and is now located at East Rochester, N. Y.  The original
factory of J. & C. Fischer was established in 1840, it being the
outgrowth of previous associations with other firms engaged in the
manufacturer of pianos.  It is one of the oldest firms having had its
inception in New York City, and during its long and honorable career
has played a considerable part in the musical development of our
country.

  "In 1896 the Fischer house celebrated the manufacture of their one
hundred thousandth piano.  The Fischer is a high grade standard piano
with a fine, pure quality of tone, and notable also for the beauty of
its case designs as well as its artistic musical excellence.  The
Fischer pianos are made in both grands and uprights and are obtainable
with the Ampico.  J. & C.  Fischer: established in 1840 by John Hugh
Fischer and Charles S.  Fischer.  Manufacturing and offices, East
Rochester N. Y. and at 437 Fifth Ave., New York. City."

The "Pierce Piano Atlas, 10th Edition" says:

  "Fischer, J. & C., Est. 1840 by two brothers, John and Charles
Fischer in New York.  Formerly R. W. Nunns & Clark and then Nunns &
Fischer around 1839.  Made 5000 pianos annually around turn of century.
Address in 1855 was 243 to 249 28th St. New York.  Taken over by the
American Piano Co. and then the Aeolian-American Co. in 1932.  The East
Rochester factory closed 7/22/82."

The serial number listings in the Piano Atlas start in 1845 with 2500
and end in 1982 with 219400.

Jack M. Conway, Los Angeles, California, USA