Green’s Dictionary of Slang

(Aus.) a measure of liquor.

1859		F. Fowler Southern Lights and Shadows 53: To pay for liquor for another is to ‘stand,’ or to ‘shout,’ or to ‘sacrifice.’ The measure is called a ‘nobbler,’ or a ‘break-down’.
1937–84		Partridge DSUE (1984) 132/1: Aus. ca. 1850–1910.