By the way, to whoever ends up with this, you feel any scratchiness at all, then you owe it to yourself to try to get the dust out of the switches’ top housing. (I think there may have been some factory applied dry lube, so you may want to add some krytox or something when putting it back together.)
A good condition blue Alps switch (and similarly for at least ivory, brown, amber, orange, green switches) is very very smooth going up and down, smoother than a NIB “vintage” MX black switch. Lots of old switches from the 80s end up with quite a bit of dust and grit inside them from poor storage conditions over the years. Comparing the best condition blue/green/orange Alps switches I’ve tried to others, there’s quite a noticeable difference. But I think it could be made up with careful cleaning and optional lubing of the switches.