I'd agree with Gerwyn here.
Never bought a special plate. Thought about having my amateur radio call sign, but I'm not into throwing money away.
As far as we know the plate on my 4/4 is original. One of my Prescott colleagues keeps saying I should change it, but her son was killed a few years ago in a collision with a deer. It gives the guy on traffic, just up the road, a bit of amusement every time he sees it.
Cheers,
