I'm afraid your memory is at fault! All 1-11s had drop-down masks.
Wrong!
I did 14 years, flying 6,000 hours and 6,000 sectors on the "Super 1-11" and I can assure you there were no drop down masks. As Fly 380 correctly said it was consequently limited to 350.
Although it would indeed go directly to FL350 at max weight it was actually outside it's performance parameters to do so - however "coffin corner" wasn't much considered in short-haul jets those days! (Also the Super was artificially MTOW limited to save on landing charges until it's last few years).
The S1-11 did do pretty good autolands though, considering the avionics fit, it was certified to CAT IIIA with a single autopilot and duplex monitors. I remember a magic box at the rear of the cockpit which lit up a series of numbers to denote the fault which had made it throw the autopilot out. However the half dozen or so genuine CATIII approaches I made worked perfectly, it was the practices that went pear shaped usually.
It also had one of the earliest RNAV fits (before that term was coined) in the name of HARCO. A moving map driven by Decca it could be coupled to the autopilot and waypoints fed in from a turret holding a dozen or so. when it was working it was great but in the Berlin Corridors in bad weather it had a nasty habit of jumping a lane and causing the US controllers there a heart attack in the process with loud cries of "TURN LEFT/RIGHT 4 -0 DEGREES IMMEDIATELY"
Flightwatch