A search for original copyright was done in artwork for the year 1928. There were no listings for Wide World Photos. There's no evidence of original 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 (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.
{{Information |Description=Photo of the Graf Zeppelin landing at Lakehurst, New Jersey, completing its first transatlantic crossing. |Source=[http://www.ebay.com/itm/1928-Original-Photo-GRAF-ZEPPELIN-LZ-127-Airship-DIRIGIBLE-/281532413180?pt=LH_Default...