I recall reading in DOUBLE GUNS AND CUSTOM GUNSMITHING that the Italian makers like Fabbri, Bosis and Flli Rizzini made a number of innovations to the "standard" London best sidelock design. While the guns continued to look similar aesthetically from the outside, the internal changes like the use of coil springs, integral bridles and overhead interceptors distinguished them from more typical best guns. The book has a rather strong critique in favor the lock designs used by the Italian makers.

Such a long, long time to be gone, and a short time to be there.