According to the U.S. Copyright Office's database, the February 1961 issue of Esquire never had its copyright renewed. It is possible that the photographer Marvin Koner retained his copyright instead of selling it to Esquire; however, there is also no result in the database when one searches for "Koner Marvin".
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 (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.