Photo of Lee Marvin as Frank Ballinger from the television series M Squad.
Date
There's a hand-written date of August 26, 1959 on back. This would have been about the time the networks sent out publicity information & photos for their fall programs. en:M Squad aired from 1957 to 1960.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
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