RCA Victor Promo Record for Jukebox Operators

This is an unusual RCA Victor promotional record I recently obtained. It was aimed at jukebox operators and plugged new releases on Bluebird records. This record is a 10" 78, pressed in vinyl. It's longer than most 10 78s, almost five minutes per side. It's interesting because if it's part of a series of such records, they're pretty scarce, suggesting that the series was suddenly discontinued after a short run. If it's a one-off it's hard to know what inspired it. This record appears to have been released in October of 1949, because an ad ran in the October 29th issue of Billboard (see below) promoting many of the same releases on 45 in addition to 78. If anyone has any more information on it please let me know.

Side One of the record. Click for an enlarged image.     Click to listen.
Side Two of the record. Click for an enlarged image.     Click to listen.