letter scale

This scale comes from France. It has the NxB Paris logo on the front. NB are the initials of Narcisse Briais from Paris. The brass scale mechanism is very similar to this photographic letter scale shown earlier. The catalog of Societé des Lunetiers of 1924 presents this scale under the heading pèse-lettres that is: letter scale. Elsewhere in a catalog of Brewer Frères in 1913 stands next to pèse-lettres also balances pour photographie, translated: scales for photography. And still beneath the picture is added the text ..aussi servir á peser des produits chimiques ou autres objets.. translated: ..can also serve to weigh chemicals or other items.. This little scale was made in France and bears the N.B. logo of Narcisse Briais from Paris. Narcisse Briais was a French instrument maker who crafted letter scales and balances between 1859 and 1886. The N.B. logo was introduced in 1876. After 1886 G. Restorf took over the company and continued to apply the N.B. logo. In 1914 Restorf discontinued the company. After this M. Ducos used the logo N.B. on his letter scales in the period 1915-1926 and from 1927-1931 M. Guérin continued to apply the N.B. logo still on letter scales (source: Le Système métrique 1997-3, page 1124). The design was patented in France by M. Restorf on January 13, 1886 with the patent number 171632. In the ISASC magazine Equilibrium 1990 No. 4, is written on page 1406 that already in 1871 the Englishman Ragg did receive a patent for the design of this same letter scale.
The weighing range of 100 grams is subdivided per 5 grams. The mechanism is made of brass. The height of the letter scale is 16.5 centimeters, the leather-covered foot measures 11 x 9.2 cm. The detachable brass bowl doesn't seem original, but it doesn't look out of place, its diameter is 6.5 centimeters.
Below some more pictures of this Narcisse Briais letter scale from Paris.