Hello,
Currently on ebay are a collection of photos of French aircraft from the Great War. Unfortunately several are either a little small or frankly not obviously interesting shots. There are however a couple of interesting photos of Sopwith 1A2 including one named Pere Alphonse. The item also has an envelope marked SOP 105 so that is a possibility for the unit,though no unit makings are visible.
https://www.ebay.fr/itm/166992287408...Bk9SR-Sm7bPGZA
A further Sopwith 1A2,possibly of F 52 from what can be seen of the markings can be seen here
https://www.ebay.fr/itm/405253676173...wAAOSwo3Rm9oy2
As usual the seller has further photos which can be found here
https://www.ebay.fr/sch/i.html?_dkr=...ancien&_sop=10
Regards,
Clint