Guadagnini copies are different from copies of Stradivari, del Gesu, and Amati. Unlike the latter three, the Guadagnini model was not used much prior to 1900, and rarely in commercial settings.
Here’s a look at two examples by well-known masters from 100 years ago: George Wulme-Hudson and Paul Knorr.
Violin by Paul Knorr, circa 1930