The French yacht VIM, could not find anything on her on the internet, so most probably she is scrapped or renamed.
Historical Sketches of Watercraft on stamps by William A Coffer, editor gives only that she was built in Lormont, France in 1929 for Mons. Bordenave, Cannes.
Additional info welcome.
Monaco 1948 15fr + 25 fr sg351, scottCB10, she is the second vessel on the stamp from the right.