Bruce,
The unit (RH) tac sign looks to be "60" - if that's correct, the unit would be 6 RAR. The smaller plate on the middle top of the grille, which appears to read "SA 4", would identify the vehicle as the fourth vehicle in the anti tank platoon of Support Company, ie S = Support Company and A = anti tank platoon.
On its second tour, 6 RAR served in SVN between May 69 and May 70 - so the timeframe fits.
Jack
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