Lotte's early bows are elegant with somewhat rounded heads, which gradually become more flattened and square in the 1930s. Beginning in 1936 he hired several assistants, including his son Roger François, who joined him in 1940. Lotte retired in 1960 but remained a presence in the shop until his death in 1970. He left behind a considerable number of bows ranging in quality from good to excellent, and his son continued the family tradition to the end of the 20th Century.
- The auction record for this maker is $5,736 in Nov 2004, for a cello bow. - 207 auction price results.