A former co-worker of mine had a Manufrance he called a Robust. I saw it one time & to the best of my recollection it was so marked. It had top lever opening & did not have the "Stepped" monoblock. I do want to think though that it had the smooth style of monoblock, but could be wrong on that. It was 16ga, very light weight, sunken rib & sling that rolled up into the butt stock. I was quite impressed with it. He is now deceased & I have not a clue as to where the gun went.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra