Settergren Piano

[SueB]

Hello everybody!

I am a librarian in Arizona who knows nothing about pianos except

1: what I've learned researching this question and

2: that I love pianos. I am trying to help a patron find out how old his piano is. He says it is a B.K. Settergren and the serial number is 20021. Here is the gist of information I have:

Settergren Piano Company
Factory Location: Bluffton, Indiana
Serial Number Dates: 1925 - 1965

History:
The Settergren Piano Company was founded in 1922, manufacturing pianos for nearly a century. The company is associated with such names as Wegman, Malcolm Love, Vough, Chase & Baker, Alexander, and Anderson Brothers. The piano changed its name to Estey Piano Company in 1935.
Information source: Pierce Piano Atlas

This site does not list 20021:
http://www.esteyorgan.com/pianohistory.html (serial numbers)

This number, 4083, is on the soundboard
and this: Stamp 680186 Made in USA (unintelligible) by Union

Any piano experts out there who recognize this? Does anybody have any suggestions that I might further research? I also found a Settergren for sale on Ebay but the seller states they don't know the year. This seems like scant information to work with and I have not seen this piano myself. I see that this seems to be primarily a British piano site, so this question may not be appropriate here but I thought I would try. In the meantime, I will change direction and try tracking down the Union stamp. Thanks very kindly in advance!
SueB

[Bill Kibby]

The number suggests 1936, but we are the wrong side of the ocean to tell you any more.

[SueB]

Thank you for your reply! I'm not sure where to dig next yet, and the patron may have to ultimately have an expert appraise it. The trail just stopped cold after The Pierce Piano Atlas (so far--I've only started looking into this). Thanks!

[Bill Kibby]

The Pierce Piano Atlas remains the best source we have for many American items, but read the Numbers page at www.PianoGen.org