This mug and jug are pearlware, unmarked with pink lustre and green enamel decoration. They are marked "Preston Guild 1842."
Most Guild memorabilia has the name of the Mayor at the time of the Guild on it, and it is noteworthy that these pieces do not.
In 1842 Preston was growing as an industrial centre particularly with textiles, and with this came industrial unrest.
Before the 1842 Guild riots broke out. The Mayor, Samuel Horrocks, was heir to the founder of Lancashire's textile trade. He read out the Riot Act, but this was ignored and several rioters were killed and more injured when soldiers fired on them.
Although the subsequent Guild was well attended, it would hardly be surprising if he had chosen to keep a low profile and not be represented on Guild commemorative ware.
There is a sculpture at the site in Lune Street where the rioters were killed as a commemoration to them.

Every Guild seems to have had medals produced to commemorate it. They are relatively common for the later Guilds, but as with al the items rarer for older years.
The picture of this medal was kindly sent to us by another collector who has it in their collection. It depicts the Mayor and Mayoress Mr and Mrs Horrocks on one side and the Preston Guild crest on the other.