In James Reyne’s song, “Motor Too Fast”, the first part has the following lyrics.
"He’s just a local boy
Modeling for magazines
Things are never quite as they seem
He’s got throwing stars, he’s got silver tops"
As Nun-Chukkas and throwing stars are Asian martial arts weapons, I would expect that “silver tops” would also be but I cannot find any information regarding it.
And no. It is not a Melbourne taxi service.