Hello,
Currently on ebay are some Farman photos showing some interesting (??) rudder markings
Farman CF 22 with an unfamiliar approach to the placement of the Tricolor
https://www.ebay.fr/itm/296662132793...gAAOSwvPpm0hnk
Farman MF.53 or MF. 55 showing a Tricolor on one rudder and the STAe number on the other
https://www.ebay.fr/itm/296662133519...BDKM&hash=item
https://www.ebay.fr/itm/296662133521...UAAOSwARdm0hnS
Admittedly,not a Farman,but interesting I thought, Bleriot XI-2 Bl.108. This machine has been seen before at the same event just showing the large 6B on the rudder,leading myself at least to wrongly believe that the 6B was an early form of STAe number. But clearly not so.
Bl.108
https://www.ebay.fr/itm/305757181612...56ac:g:n1wAAOS
wV4Jm0hn~
Regards,
Clint