Just to re-iterate the Australian context of 79 on black in more detail (the vehicle is, after all, in Australia):
79 on a black background was the unit sign of an Aust Divisional Provost Units 1940-1941. In 1942, Aust Divisional Provost Units were assigned the Unit sign 95 on a black background. This they retained until the end of the war, firstly as the single numeric sign '95' on a black background, and from 1944, '95' as the lower (denominator) with the actual unit number above. (As an aside, Aust SOVOs in 1960 also assign '95' on black to Provost Units.
From early 1942, Aust Mobile Bath Units in any formation (Army, Corps, Division, Lines of Communication Area, District Commands, etc etc), were assigned the unit sign 79 on a black background, examples being:
1 Aust Infantry Division: 105 Aust Mobile Bath Unit;
2 Aust Infantry Division: 106 Aust Mobile Bath Unit;
Northern Territory Force: No.s 115 & 116 Mobile Bath Units.
'79' was also assigned to AIF(ME) Base 1 Advanced Depot Medical Stores, initially with a 2 inch white bar across the bottom, later the 2 inch white bar was deleted (once a Formation sign was issued).
Mike C
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