Originally Posted by
de facto
Was the same in my previous airline.
Same here. It is known as the alternate MTOW and is applied at certain airports and and listed on the flight plan as a heads-up for flight crew awareness.
Then on the cockpit pre-flight check, one checks that a two-sided removable placard is displaying properly.
If using the alternate MTOW, that weight should be displayed. If using the normal MTOW, the blank side is displayed. If incorrectly displayed, let maintenance know and they will remove a couple of screws and flip it over.