Assuming this is an upright (vertical) piano, the serial 261236 would belong to a unit built sometime in 1936. If the serial number belongs to a grand instead, it would have been built in 1984.
how old is my baldwin keyboard serial number 91002/28
How old is this piano with serial number 1510355
1978
As of November 2013, the age of a Baldwin piano with serial number 246905 would be 32 years old.
Very old about 209 years old
1980
1986
207 years
According to my copy of the Pierce Piano Atlas, the Baldwin piano with serial number 127398 was manufactured in 1954.
According to bluebookofpianos.com, an Acrosonic piano with this serial number would have been manufactured in 1964.
According to http://www.bluebookofpianos.com/serial1.htm it would be between 1946 and 1956.
It was made in 1979 according to the pierce piano atlas. Baldwin could confirm this. They are now owned by the Gibson guitar company.