Brad:
The deco style (with round letters) name plates from
about 1948 to about 1958 or maybe slightly later did not
have a blue background. The background was an aluminum or
grayish color with the brighter polished letters spelling
AIRSTREAM. My 1957 Flying Cloud (since sold) and 1951
Clipper both have this type of deco nameplate. I'm not
aware of anyone who is reproducing these grayish background
deco style AIRSTREAM nameplates.
Fred C.