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More info,
I found several catalogs and ads on the web,
in the 1929 ad, it shows the small shield styled decal,
in a 1939 catalog, it hows the larger blue rectangular decal.
and in the '46 and '49 catalogs the blue decal is shown.
I also saw in the 40's catalogs, a comment about both the Rainbow and Owasco having all mahogany trim (except for the rails).
so with these constraints,
1921 to 1933'ish >> the small shield decal
1933'ish to 1939'ish, >> the horizontal oval
from 1939'sh to 1966, >> the blue decal
anybody have any other Penn Yan catalogs?