Design for a portrait medal, perhaps showing Jacob Künhans, in a circular cartouche topped with a ribbon

Christian Friedrich Hecker (active Italy circa 1770-1790) Design for a portrait medal, perhaps showing Jacob Künhans, in a circular cartouche topped with a ribbon signed, inscribed and dated 'Christiano Federico Hecker di Bernsbach in Saxsonia Venezia li 1. Giugno. 1779.' and with number '7' black chalk 5 7/8 x 8 3/8 in. (15 x 21.2 cm.); with three other drawings by various hands, including Design for a double-sided portrait medal representing Jacob Künhans and the collector of medals Abate Angelo Bottari; Fame and Time by Giuseppe Carlo Zucchi, commemorating the defence of Gibraltar from the Spanish by Elliot in 1782; and Frontispiece of Jacob Künhans's Album Amicorum, 1780 (4)