Are you sure it is a Sandman? Did you get this VIN tag?

It has some Sandman features like the Kingswood grille and Kingswood door trims (although it could simply be a Kingswood!) plus 1950kg GVM.

However it has some Sandman features missing like GTS headlight surrounds, mirrors, blackouts. Plus it is a trimatic which is very rare in Sandman.

My guess it is an XU4 Kingswood van with a full instrument dash and sports wheel either factory ordered or fitted later. Could still be a Sandman with bits removed over the years though. Interior looks too original though to have been majorly stuffed with elsewhere.