Requested as part of a Mk VC order submitted on 12 May 1942 under contract B197813/39, MB945 was built at Chattis Hill as a PR XI, with c/n 4875, between July and 7 October 1943, when it made it's first flight at Benson. Passed to the USAAF on 30 October, the aircraft was assigned to 7 PRG, 14 PRS, based at Mount-Farm. Flown by Lt. Franklyn I. Van Wart on 1 March 1944,  the aircraft was reported as lost in the English Channel, but was actually captured by the Germans, repaired and flown as part of Zirkus Rosarius as T9 + BB.
- Known to Supermarine as either Type 365 (Production) or Type 374 (Converted Mk IX).
- Morgan, Eric B and Edward Shacklady. Spitfire - The History. 2000. ISBN 0 946219 48 6 Page 387
- Morgan, Eric B and Edward Shacklady. Page 399
- Morgan, Eric B and Edward Shacklady. Page 400