Hi Remi...
As per
http://www.luftwaffe-experten.org/stam-s.html
On page 394 of "Luftwaffe Camouflage & Markings 1933-45 - Volume Two" by K.A.Merrick [Classic, 2005] the example below apparently belonged to SG103, was found at Metz-Frescaty airfield in France and was recorded on Crashed Enemy Aircraft Report No.266 dated February 1945:
Fw190A-4 coded SK+OU 3 - SK+OU black - 3 yellow outlined red (WNr.0799)
Cheers
Peter D Evans
LEMB Administrator