Bill, thanks for the info.  I took a closer look and from what you
describe about the Dayton piano, I can be reasonably sure it is not a
Dayton.  The 'Orth' piano does have separate holes for the tuning pins
in the plate; it does have a window in the plate for the S/N.  I
believe my original note was in error on the "New Scale".  This is cast
into a trim piece that screws on above the plate (it overlaps the top
edge of the plate and is about 2.5" high).  The words appear at about
the center of the piano. Also, on this same trim piece "Fully
Warranted" is cast on the left hand side.  This particular piano has a
Standard Double Valve action and from the look of the wind motor
brackets (cast, not stamped steel) and a few other details, I am
guessing that it is an older vintage of Standard.  One other question
Bill, were piano serial numbers given out in some sort of sequential
order to various mfr's as they came along?  Are they never repeated
from one mfr to another?  If so, might it be possible to go into the
piano atlas and look for the serial number (or the block of numbers it
would be included in) and back out the mfr this way?  I realize this
would not be an easy task but it seems possible.