Early Italian Glass Swirlback Buttons

Antique Italian Glass Swirlback Buttons - The large ball in the middle is 0.80" - The matching small ball to the bottom right is 1/2" - The dome buttons match in design and colors and are 1/2" - I am going to call these pretty rare - I have been collecting these ball buttons for 25+ years and these are the only ones I have been able to buy - The large one was one of my first buttons (Brimfield) and as a marble collector, it stood out - I was advised by a fantastic button dealer that these were probably mid 1800's, but I do not know for sure - Would love additional info!!!