Some CED's issued late in production have two caddy labels, one glued directly over the other. RCA prepared an equal number of discs and caddies, but if some discs were rejected during the visual inspection step of the production process, there would be some left over caddies. RCA started to "use up" these extra caddies during the final stretch of CED production, so the label underneath is for an earlier CED release.
It is also possible that there may be some misprints on the label underneath. I have one disc obtained from an RCA engineer that has "Cat on a Hot Tin Roof" in front, and "Oklahoma" on back due to a misprint. Since "Cat on a Hot Tin Roof" discs had already been loaded into the caddies, these discs were given away free to RCA employees.
But if they had caught the error while the caddies were still empty, the caddies may have been saved for eventual relabeling. It's my understanding that RCA also mis-stamped some discs, so the two sides are from different movies, but these ... more.
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