Hi - I am a volunteer researcher supporting the Museum of Making/Silk Mill, Derby, UK. https://derbymuseums.org/museum-of-making/
The Lombe silk mill at Derby (constructed ca 1720) has an Italian worker, Ignazio GUARDAVAGLIA (anglicised 'Ignatio/Nathaniel Guardavaglio'), who is recorded as 'a native of the kingdom of Sicily' for the 1727 baptism of his son, John, at St. Alkmund's church, Derby.
He married twice in Derby, and died in Stockport, Cheshire, burial 29 March 1747 (as 'Nathaniel Guardivaglio'), St. Mary's church.
We do not have year/place of birth, but one possibility is Messina, Sicily, ca 1700.
Is Ignazio GUARDAVAGLIA a close relation of your Giuseppe Guardavaglia ? Do you have any further details ?
Regards, David Purdy, UK.
