Photo of Wilt Chamberlain doing the Twist with 2 dancers from the Idlewild Review show at Smalls Paradise. Chamberlain was the owner of Smalls at the time.
A search for renewal was done at copyright.gov. There were no renewals for Jet by Johnson Publishing Company. The 2 listings for Jet are new registrations in 2010 and 2011. A search for the photographer, M. Associates, also turned up no results. There's no evidence of continuing copyright.
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.