Just to add a little to this thread.From what I have read Holden from the start made the Sandman from two models .The HJ Kingswood Sandman that were made up until September 1975 they had body colour in the tray and the HJ (Belmont)Sandman had vynacoat in the tray.Septemder was the date they changed to making Sandmans from the (Belmont) or base model Holden only.No more Kingswood Sandmans after this date and this is an another reason it is hard to identify a HJ Sandman.As for tray colours after this it may come down to what plant your Sandman was made.