1189 is Spanish Red which is a 1969 HT colour so it is a rare colour on a HZ. 63C trim code is Buckskin which was not available on late base model HZ's unless it was a Sandman.

I would like to see pics of the 3 plates as it does appear to be a Sandman. We need to see the build date, GVW and if it is a two seater. I assume it has a full headlining.

More info and pics are needed to identify this van....