Made my first purchase during the pandemic, an 18 size Centennial, to work on as it seemed promising in that it apparently runs somewhat and still has the glass cover over the back of the movement. I buy these sporadically as my great, great grandfather marketed them from the late 1870's to the 1890's. His partner, Henry Beguelin was probably the impetus around the importation. Hopefully, and I use that word loosely, it actually does run to the point of being able to repair it as parts are not interchangeable due to the Swiss way of making watches. I have purchased close to 75 of these and have not been able to switch any parts except the cases.