Without documentation to prove it a Sandman, I would say it is not. I would be more inclined to see it as an optioned up panel van rather than a Sandman, you must remember that a lot of buyers didn't want all the graphics and looks of the Sandman in its day and the fact that the stripes were a delete option on HZ bears this out. My father passed up an L31 M21 HX Sandman in favour of an L20 M15 HZ van in 1981 because he wouldn't drive that "bloody lairy thing" on the roads. At 19 I was begging him to get the Sandman!!!!!!