Beag,
That's new to me...I've read in threads on this forum about abielle, but the only examples I've seen were marked "L'Abielle".. I've even viewed one of their catalogs...but anyway...if you want to learn more about your fixed (sliding breech) shotgun, you should borrow a camera that has a macro setting and post several detailed pics of your gun...some of the contributors on this system know every detail of the French proofing and touchmark systems...if I were you, I would post the photos and print their responses for your records...sometimes, the more you know about your gun, the more it's worth...especially to yourself...these guys will also tell you the best courses of action to take in order to get it back into service...
