Yeah, the Combo tool was given a half stop some time before 1991, perhaps as early as 1986. Here are some thoughts I put together on the changes in the 84mm Combo tool.
"Most folks who like to look at the development of Victorinox's tools will be familiar with the original shape of the Combi tool and what it looks like now, however I have found what appears to be a distinct and identifiable middle stage of development. So on to the first Combi tool:
The most striking feature of this is the bulbous tip of the tool (oh-er

) but there are other things that make this notably different to the modern tool. Firstly the 'hook' that catches on the underside of the bottle cap or can is really quite pointy and sharp. Also the top edge by the nail nick is very angular in shape, not the smooth curve we will see later. The last thing is something we can't see, it has not got a half stop when opening and closing. This seems to have been in use between 1982/3 and 1986.
Moving on to what I think is a middle stage of development. It retains the sharp hook and the angular top edge but the screwdriver tip has changed into the form we can see on the modern tool. Also it has now got a half stop. As this is on a Waiter that has a fluted corkscrew than the likely dates would seem to be 1986-1991 but I will be the first to admit that's just an educated guess.
So what we have here is a modern tool on a Waiter that is about 5 years old. The tip of the hook is now far more rounded and we can see that the top edge has now become a far smoother arc rather than the angular shape we've seen in the previous two pictures, it also retains the half stop.
OK so the changes between 2 and 3 are pretty much cosmetic but I think they are different enough that it is more than just a case of one being polished more than the other, all my other modern Combi tools have the same look as number 3."
What's actually surprising (to me anyway) is that it's taken Vic so long to update the cap lifter for the 84mm range. With the 91mm one it has had the half stop since 1985 and the extra 'hump' since the mid 2000's or so. The improvement was long overdue.