Lot Essay
The royal cypher may refer either to King Frederick William IV of Prussia (1795-1861, ruled 1840-1861) or his younger brother King Frederick William V (1797-1888) who acted as a regent after the stroke which incapacitated his elder brother in 1858, and succeeded him in 1861. King Frederick William V of Prussia was proclaimed German Emperor as William I in Versailles in 1871.