It's a 1977 model.

Well strip my gears, I had thought it was a 1975 model. Don't know why, but I did.

South Africa seems to have had the dies for the early production body shell, but sourced it's driveline components & many other parts from Japan.
I presume that for reasons of economy, they did not produce the facelift variant nor adopt the revised emblem placement, but it would seem that once the original metal grilles ran out, the facelift version was used without the adoption of any other facelift features.

It would also seem that the B210 model was not produced there at all & Hendrik's 1977 model still uses the 1200 engine, whicg suggests that they either had HUGE stocks of them, or produced the engine locally.
The GX induction is of the flat top carb variety, so these would have been sourced from Japan. I would be curious to know if these post 1973 blocks with the front distributor used the revised rocker oiling system as I suspect that the GX heads may have been ex-Japan too & I presume that they would have been of the later rocker oiling type.

All very interesting.

No worries Dodgeman.
The engine is the one with the distributor at the front and altenator in the right (standing infront of the car)bottom corner beneath the waterpipe.

Yeah, I remembered while re-writing the post. I suspect that the blocks may have been made in ZA as this block was discontinued from 1974 onward in Japanese production.
It would have been a fairly simple production change to drill & machine the blocks for the later rocker oiling, & even if the block was supplied as a service replacement for an early car, the earlier head will still work just fine with this system.

GxMan, is your A12 engine the original one? Many 1200s have had the engine swapped once in their life.

About B210s in South Africa, they had them. They were sold there long after Japan, USA and Australia had switched to the B310. Here is a picture of the Chassis ID plate for an 140Y B210 for "Datsun Nissan Sud Africa"... and here's one about the "1980" B210.