What conditon is your Sandman in?

[Sandaro]

Sounds right, I think that Holden changed the model year each September in the year prior (in line with GM in the states), other manufacturers do the same. In the states you'd actually have a new model released every year in September, but that didn't happen here obviously due to smaller population not making that frequent a change worthwhile

[Bobcat68]

Thanks Sandaro, that explains why my van (10/78 build) has a J (79 year) as I also was confused about it.