Re LITERACYHere’s some information from Dec 1827 to show that a John Spilsbury CAME FREE
Windsor …….. John Spilsbury, came free to be Constable from the 6th instant, in the Room of James Union
http://trove.nla.gov.au/ndp/del/article/31759277 The Monitor 17 Dec 1827
And then : Here’s the notice in the newspaper, whereby a John Spilsbury of Windsor inserts advert re his wife, and the advert includes a witness name to certify John’s x mark.
May I note that
IF these two articles are referring to the same John Spilsbury, then the Constable would seem to be simply crossing all the “t” and dotting all the “i” as one would expect of anyone with experience of policing the laws. .
http://trove.nla.gov.au/ndp/del/article/2204414 The Sydney Gazette 12 January 1832.
Re X Marks on Trove's digitised newspapers I recall various adverts with his or her X mark mentioned in those newspapers. I also recall reading X mark mentions in the earlier versions of historic newspapers .... at the following link :
http://www.nla.gov.au/ferg/ADD, and of course, the references to Windsor, are to Windsor, NSW, .... The Hawkesbury District

and of course, it is quite possible that there were two different chaps with families in the Hawkesbury District at the same time named John SPILSBURY.
Cheers, JM