The 190 F-series is just a re-designation of specific factory conversion kits (Umrüstbausatz) to the A-series. The F-1 was earlier known as the A-4/U3, the F-2 and F-3 were the A-5/U3 and U17 respectively. F-4 to F-7 were not produced. The last F-series 190 produced was the F-9 that had the uprated engine of the A-9 and the new Ta 152 tail unit. 147 F-9s were built in January '45 and perhaps a few hundred more before VE-Day.