From the listing:
Maserati 250 F Tipo Ex Fangio 1954/6 Grand Prix Car
Purchased from the works and fully restored, one of the first 4 purchased from the Maserati factory and restored by Cameron Miller, Full FIA papers.
Car no longer listed for sale.
Price not listed.
While looking up the history of this car I found this video on youTube where Martin Brundle drove one.