He was aged 18 when he arrived as a convict in Tasmania, sentenced to 10 years of penal servitude.
This followed his conviction in England for theft of a copper tea kettle and previous burglary and housebreaking offences in the Northumberland area with accomplices William York, John Tunnel and John Whitsey.
Mawby, York and Tunnel had spent time together on a hulk.
He was tried at Lancaster Salford Assize on 21 October 1841 and embarked from Spithead five months later on 17 March 1842 on the Candahar.
Mawbey arrived in Van Diemen's Land (Tasmania) on 21 July 1842.
[AOT says embarked 2 April 1842; QSR says 26 March 1842]
His religion was Protestant, occupation brickmaker and he could read and write.
JOHN MAWBY'S PHYSICAL DESCRIPTION
Trade - Brickmaker; Height (without shoes) - 5ft 11in; Age - 18; Complexion - fresh; Head - oval; Hair - black; Whiskers - none; Visage - round; Forehead - low narrow; Eyebrows - black; Eyes - ditto; Nose - small; Mouth - ditto; Chin, broad; Native place, Northampton.
Remarks (tatoos) - freckled sailor with flag bottle and glass J + MJ + H on ... arm; woman holding flower E x MM+B on left arm. [Source: Archives Office of Tasmania]
He was granted a Ticket of Leave on 3 August 1847, and a Certificate of Freedom on 21 October 1851.
On 29 November 1852 he sailed from Launceston to Melbourne steerage class on the Yarra Yarra. [Source: Tasmanian Archives Office - Departures.]