Welcome to the world of French guns, assuming of course it is your first. It has been a steep learning curve for me, as there could be many variations of one model. Here is a link to the highest end Robust I have seen:

http://www.naturabuy.fr/RARE-ROBUST-252-PRESTIGE-item-1575919.html

Also, there is the version with mono block stepped barrels built on the Ideal round action:

http://www.naturabuy.fr/DEPOT-VENTE-TRES-BEAU-ROBUST-IDEAL-N-274-item-1614919.html

As you bought a 16, I infer that you are a person of taste and accomplishment. Enjoy.

Mike

Tolerance: the abolition of absolutes

Consistency is the currency of credibility