Special thanks to Sal, a member of the clarinetpages.info forum for this very helpful information!

Rampone was a caftsmen family in the early 1800 that turned musical instruments (flutes, clarinets, fifes), using natural woods available on site such as pear, dogwood, boxwood, etc. in Quarna (near Orta Lake, district Verbania, Italy).
A descendant, Agostino Rampone, in the second half of the 1800, was flutist at “La Scala” in Milan; technical and innovator, he perfected the Bohem system on the flute and he met Adolph Sax and built for him some early prototypes to study the mechanics of the saxophone keys. In the early 1900 a Rampone descendant and a lady Cazzani, daughter of a Milanese manufacturer of brass musical instruments, gave birth to the "Rampone & Cazzani". In half of the 1900 the company went bankrupt and was taken over by the current owners.
Currently the production, internationally acclaimed, is dedicated exclusively to the saxophone.

I own a hard rubber clarinet, with alloy keys, simplified Muller fingering (twelve keys and two rings), C tuned, Low Pitch, 592 mm, 23.30” lenght overall, s.n. C7342, dating from about 1930, probably from a marching band, marked "Jedson" and "Ditte Riunite A. Rampone & G.B. Cazzani" from a joint venture with the London-based “John E. Dallas & Sons”, later famous for producing banjos and guitars.