A rare Jacobite type glass mid 18th century

A rare Jacobite type glass mid 18th century, engraved with the motto 'Turno Tempus Erit' above a rose spray, six-sided star and the word 'Fiat', raised on a double-knopped airtwist stem, 15.5cm. The phrase Turno Tempus Erit is probably borrowed from Virgil, and roughly translates to mean 'The time will come'; perhaps an insinuation that the Hanoverian victory at the Battle of Culloden could be short-lived.