I don’t want to appear rude, but, this statement below appears to be somewhat inaccurate as it appears to be the entire production of Vincent V twins!
In 1991 Argentina lifted restrictions on the export of its ‘national treasures’. These included some 800 Vincent HRDs imported from 1946 to 1950 when the going was good there (not so good in England). The first production Lightning, first Series C Shadow and other glories were said to be among them. Most, in fact, were destined for the Federal Police and Peron’s Presidential Guard, plus a few ”playboys” who would ”tit up and down the Avenida 9 de Julio” (my translation, from memory).