[AC Ventura]

It’s all based upon inertia and thread technology. Whatever side, imagine you are holding the spinner in your hand, the car is going forward, so what direction does it do up? So the LH side is RH thread and vice versa. But whichever side, to undo it, tap the top of the spinner towards the front of the car.
The theory is the same of you have an Austin Healey, Sunbeam Tiger, or a AC Cobra. Regarding the latter, in the UK, we use Phosphor Bronze spinners and anti sieze copper grease, just to be sure.
Incidentally and no offence to learned owners, we use lockwire to see if the spinner has worked loose, not to stop it undoing.