Very nice score, Ted.
As you know, the French like slings on shotguns.
that is because of their automatic response to drop whatever firearm they may be carrying and raise their hands whenever someone raises their voice.....the sling has saved many a French SxS from unnecessary damage, so much so that they even built some SxSs with the sling built right in.....
"Build". That sling is refered to as the "Bretelle Automatic". It is still possible to get one to this day. I ordered a new 16 gauge R11, for a good friend, that was reviewed in Shooting Sportsman by Vic Venters, that was equipped with that sling.
I never cared for it, as the sling is a bit narrow, and less supportive of the weight of the gun as a regular sling. OK in a pinch, I guess, but, I much prefer the Bretelle Darne.
There are a lot of pre war Darnes floating around with the fitting in the stock, but, the sling missing in action. That is a shame.
Best,
Ted
