Well let me see, it was in the early to mid 70's when I saw this Robust, so 40 years ago. Memory may have slipped a bit. Maybe it didn't have the top lever, but I distinctly remember it did not have the stepped barrels. It may not have been monoblocked at all, just can't say for positive. I do recall it as way nicer than the Robust model which was then currently being offered. This gun was stated to be an older Robust.

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