Don,  Congratulations on acquiring your Estey church organ.
Reed organs typically bring low prices, but the two manual plus pedal
instruments are in more demand, often changing hands for over $1,000.

You may want to recheck the serial number.  The mission oak style
dates from the 1920s more or less, and the Estey serial numbers in
that period had six digits.

There is an organization devoted to reed organs, The Reed Organ
Society.  It publishes a quarterly bulletin with interesting articles
on reed organs.  If you send me your mailing address I will send a
brochure on it.  There is also an automated Internet mailing list
serving reed organ enthusiasts: the ROS list.  Contact Jim Tyler
<tylerj@crl.com> if you would like to subscribe.

I have two books available on the subject in print: "The American
Reed Organ and the Harmonium," and "Gellerman's International Reed
Organ Atlas."  The first is a broad treatment of the subject and
includes several hundred illustrations; the second is a directory
of all the known manufacturers in the world, with brief histories and
lists of serial numbers where available.  They may be in your local
library, or you can buy copies from me.

You may also be interested in Robert Whiting's "Estey Reed Organs
on Parade." This is a reprint of representative Estey catalogs.
Contact Out-Back Mechanical Music, 6 Front St., Bainbridge, NY 13733
for information.  It may also be in your library.

Fritz Gellerman