1907 photo of Syndicat des Fabricants de Canons de Fusil de la Vesdre (Trade Union of the Manufacturers of Guns of Rifle of Vesdre) from Little Gun


I would add CC - Lucient Clement, also shows marks as CC AA & CC LC. Shows up on some guns made for Sears.
SC with crown - I am going hazard a guess that it was a variant of the mark of Charles Spirlet, who also used a Crown over CS and Crown over S. If some one has a better identification, please correct me.

These came from Researcher who deserves the credit:
Three-lobed crown over a D = Didiere barrel works of St Etienne, France.
He also tracked down SB&Co.

Pete