I'll add my two bob's worth also. My 12/78 sandman ute ( I bought it new) had the badge in the top centre of the grille, exactly the same as the photo that Sean put up.
I don't really put too much faith in paper work or brochure's from the day. Same as the question about footwell light's being an identifying factor in the HZ sandman. They were never fitted in my ute. Hope this help's.

Cheers.