Violin in violin case, probably Hopf around 1850, restor… | Drouot.com
German Hopf violin c1900 with 35.5cm two-piece maple back impressed HOPF, maple ribs and spruce top, also marked HOPF internally L58.5cm overall; in Maidstone ebonised wooden coffin case with bow - Musical
Hopf Violin | National Museum of American History
David Christian Hopf Antique Violin 1760 | Reverb
Sold at auction German Violin, Hopf Family, c.1820 Auction Number 2333 Lot Number 287 | Skinner Auctioneers