This instrument has been listed under various dates. The Hills listed it as both 1723 and 1725, Partello as 1721, and Lyon and Healy as 1722.
How Many Strads, Ernest N. Doring, Ernest N. Doring, William Lewis & Son, Chicago, 1945
"A Stradiuarius, 1723, lent by H.R.H. the Duke of Cambridge; purchased by H.R.H. the late Duke of Cambridge from Count Platen, of Hanover, who had bought it from Stradiuarius; grand pattern." [probably this instrument]
A Descriptive Catalogue of the Musical Instruments in the South Kensington Museum, Carl Engel, A Descriptive Catalogue of the Musical Instruments in the South Kensington Museum, London