Green’s Dictionary of Slang

metallician n.

[their stock-in-trade, metal coins]

(Aus.) a bookmaker.

[Aus]Bulletin (Sydney) 17 Jan. 13/4: ‘Three ter von to you, as a favour, seein’ ash how id is our first dealings,’ replied the anxious metallician as he mentally gloated over the well-feathered pigeon he was about to pluck.
[Aus]Bulletin (Sydney) 26 Sept. 5/3: ‘Better get shorn,’ remarked one rising metallician: ‘I’ll buy the fleece.’ ‘Thanks,’ replied the meek young man; ‘when I want to be fleeced this is the shed I will come to.’ And as he passed on the books thought that they had not ‘skinned the lamb’ that time.
[Aus]Dead Bird (Sydney) 14 June 1/3: Our friendly metallician retired into a corner of the refreshment room and wept bitterly.
[Aus]Sydney Sportsman (Surry Hills, NSW) 14 Nov. 1/2: A jockey [...] is as honest as most of the metallicians.