But WhiskyTango should have some for sale still in the Classifieds.
He has some old ones, but no more those with the big logo. IDK if they are as smooth as the "real" vintage ones. Heres his classifieds thread.
He literally pulled them from the same WYSE boards and he even says its the same stem and spring with a slightly different logo. Should be fine.
OP: To answer your question, I have found them on old WYSE terminal boards. There are a few different models I have had experience with finding vintage blacks on:
PCE - p/n 840358-01
WY-50 - p/n 840059-01
WY-60 - p/n 840338-01
WY-85 - p/n 840366-01
AT Standard?
this one - Don't remember the part number
Just to clarify, I didn't make the rules on identifying vintage switches. The only switches I have called "vintage" are the ones with the larger logos that others have previously documented as vintage by other people. To be honest, the other "old" switches I have feel about the same to me, but then again, I don't use linear switches. Blues and ghetto greens baby! Anyway, I call them "old" because they don't have the large logo, but they are also clearly different from current production switches.
There's no clear way that I know of to tell what kind of switches a keyboard will have before you take the caps off and look. Sometimes, the ones that look really old and used will have very few "vintage", and sometimes the ones that look newer will be choc full of them. This leads me to believe that there is no clear cut-off date, but that there was a gradual phasing out of one generation of switch housing being replaced with another so that you find them mostly side by side on the same boards.
Edit: I also agree with what Ivan posted before on this subject, that they probably made switches out of whatever parts were available. So you might have older stems mixed with newer switch housings and vice versa. It's not like they shut down the Cherry factory for an overhaul and came back online with all new switches or anything like that. So CPT, you could be exactly right with what you said, everything could be the same about the switches except for the top half of the switch housing.
I think part of the draw of these is the novelty having a switch with the older style of logo on it.