Metallic coloured vans were common in HQ series and certainly during 1973 and 1974, very few of them were Sandmans. None of the 1973's could have been Sandmans, but they were metallic coloured and I don't believe that you should use metallic paint as one of the basis for determining whether a vehicle is a Sandman. HK has a much better and mnore comprehensive list of ways to sort out what was what.