Ho hum! Looks like I got that one wrong chaps

My sources were various and mostly French. As my French isn't even to schoolboy standard I suppose errors of translation are to be expected, errors of fact are a bit different though.
According to
"Les Avions d'un As" by Bernard Klaelyle and Philippe Osche, S11
5 it was. A far more authoratative source than my site will ever be, they have Guynemer scoring his first SPAD victory with S115 on 4/9/16, an Aviatik CI; pilot Hans Steiner, obs Ltn Otto Fresenius.
The
Guynemer site is way overdue for a revamp and I plan to have a go at the Special Hobby SPAD sometime soon to that end.
Fingers crossed your fine model doesn't emulate the real S115 too closely