Oscar Massin was born and operated in Paris, France around 1850-60.  He was born in 

Liège in 1829 and began an apprenticeship in 1842 which he continued with until 1851 when he moved to Paris.  His first job in Paris was that of a journeyman before he was promoted to Chef d'Atelier in 1854.  A year later he moved to the Viette to work on the commission of a tiara for the Empress Eugenie.  He, as well as the other eight workers crated the crown jewels that were exhibited at the 1855 World's Fair.  His style changed shortly after and by 1867 he exhibited a new look at the Worlds Fair.  With lots of interest in his work at the Fair Oscar decided to open his namesake in 1869.  His business grew rapidly eventually employing around 25 employees.  He worked tirelessly until 1892.