His main contribution to violin-making was his work on varnish. The purfling's joints are often cut on the straight and not on the bias as was traditional, in the middle in the pin. His brand is burnt at a length of 1 cm. There is generally a black dot on the joint of the top under the bridge. He used an external mould. The stop is generally 193 mm long. In this respect he follows to the French 18th-century tradition of a short stop (190 mm), which was traditionally 195 mm long in Italy and even 200 mm long in Germany. The violin's serial number is inscribed in the middle inside the instrument. Its date (only the last two figures) in the upper paraph on the back. His violins of the first period have large edges and his brand was then burnt inside the middle bouts. The varnish varied from orange-red to red. After 1860, his varnish became lighter.