hard to say if its a repro, but im going with most likely. the plastic piece that would have one day had a horn button on it is different to the original ones i have and seems to have the electrical horn contacts moulded onto it by the looks, mind you i only have hq-x caps. the originals had a floating basket that sat inside the wheel boss area and had brass threads to make the horn go honk.
here is a pic of my NOS wheel (3mm spokes) in its off the shelf condition, on the left is the hq/j horn cap and the basket:
going on your photo though, the ignition barrel being black and glove box having a black latch means your car is HZ, so the horn cap may have had the x-shaped plastic in it... i'd need someone else to confirm this.
the easiest way to check is to take it off and look for the holden stamping on the back of the boss area.
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