LaCroix / M. LaCroix
Seen on eBay. Looks like a Thibouville or Couesnon. Because of the curved register key, this would likely be from the early 1920s.
Albert system clarinets were also made with the LaCroix stamp. The one I got to work on is a very cool LaCroix C clarinet. I would guess this is a Thibouville product.