This photo of Zasu Pitts and Thelma Todd has signatures for both* and was addressed to someone named Bob. It also has been dated 1931.
The back has been stamped "Pitts-Todd Comedies, Hal Roach Studios" and "Please Credit Photo By J. Eldee Hester".
* The studios commonly sent out movie star photos that were actually autographed by other people who were hired for that purpose. I am not an expert and cannot guarantee the authenticity of these signatures.
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