Possibly the Swedish royal family, Stockholm. By 1909, the Wachtmeister family, Knutstorp Castle, Scania, Sweden;[1] by descent in the Wachmeister family until Countess Ebba Wachmeister, Knutstorp Castle, Scania, Sweden; acquired 2017 by Kunstkammer Georg Laue, Munich; purchased 2022 by NGA. [1] The cup was published in 1909 as belonging to the Wachtmeister collection at Knutstorp Castle in _Svenska Slott och Herresäten: vid 1900-talets början_, vol. 2, p. 186. According to oral tradition in the Wachtmeister family, the cup was given as a wedding gift to a family member by a close friend of Queen of Luise of Sweden around 1860. It is most likely the counterpart to a similar nautilus cup in the Nationalmuseum, Stockholm, which was acquired as a bequest from King Karl XV in 1873. Given the similarities between the cups, it is reasonable to conclude that the Swedish royal family acquired two etched nautilus shells around 1670 from Amsterdam to be mounted as a pair of cups, which were kept in the royal collections until the latter half of the 1800s. See email dated 30 August 2022 from Virginie Spenlé of the Kunstkammer Georg Laue, Munich in NGA curatorial files.