Not a Sandman, just a normal HJ Holden van with a few options. Nothing unusual option wise and not a special order. The only things it has which were not possible as assembly plant fitment are the console if it has one and the dual exhaust.
Only one tag gives you the vehicles year: the ADR tag which should be 12/74. The E means 1975 model not year, which for HJ is 9/74 through to 8/75.