Identified as an "ex-Dumas" instrument.
The Jacques Français Rare Violins, Inc. Photographic Archive and Business Records, 1844-1998, Archives Center, National Museum of American History, Smithsonian Institution, The Jacques Français Rare Violins, Inc. Photographic Archive and Business Records, 1844-1998, Washington, DC
One of the instruments exhibited in Brescia in June, 2007 at the "Gio Paolo Maggini Secoli di dettagli" exhibition.
Gio Paolo Maggini, Exhibition - Brescia, Italy, 2007
"Judging from the design and position of the les, this cello should be at first a five-stringed instrument and later transformed into a four-stringed cello. . .
. . . it is possible that the Prince de Chimay, Pierre-Paul Riquet (1604-1680), purchased the cello, since his wife, Princess Christine was a famous musician. Despite that we lack direct evidence to prove that Pierre-Paul Riquet owned the cello, the fact that Marie Joseph anatole Pierre Alphonse de Riquet, Prince of Chimay sold the cello in 1896 has been verified."
The Legend of Italian Violins: Brescian and Cremonese Violin Makers 1550-1950, Dai Ting Chung, The Legend of Italian Violins: Brescian and Cremonese Violin Makers 1550-1950