From "Label Types Of Bluebird Records" by Colin J. Bray and Jack Litchfield:
"From 1946 to 1950 some Bluebird recordings were re-released using the original Bluebird serial number on the RCA Victor label. The notation “Bluebird Series” appeared around the rim of the label" (source).
So the earliest date for this reissue would be 1946.