chiptea wrote: Wait, you found another one?

Well, I certainly didn't plan on buying another one; there was someone on GeekHack who found 3 DocuTechs and I didn't at all care to buy any from him, since I really do have my fill with the four I have.
However, there was an auction
that had a keyboard from 1992 that piqued my curiosity.
Being that this was a 6085 system and keyboard and not a DocuTech, I was one, surprised to see a 6085 keyboard dated 1992 for a system whose production I thought ended in 1989, and two, surprised that the seller was friendly and actually popped off a key cap for me after I clarified.
After that, I geeked out about keyboards to the guy and we started having exchanges over email and we talked a little about the Xerox PARC stuff. He had come into a ton of old internal Xerox stuff from his brother who worked there, and he even had a NIB Xerox 6085 keyboard from October 1985, which really tempted me.
http://imgur.com/a/aSyi8
He really appreciated some of the insight I gave him on keyboards and all that and it made me happy that he was actually interested and not a curmudgeonly guy, unlike the guy who sold some 6085 stuff before him on eBay.
I was honest with him about the significance of the 6085 with SKCM Green and we worked out a deal and I ended up buying it after his original listing for the entire system didn't sell and he parted it out for me (since he had a spare model from 1988). I paid $300. Yeah, ouch.
I spent $100 on four DocuTechs. I figured this was worth it since it's quite a bit more rare and significant in that it's pretty much THE example we needed to bridge the gap in the question of whether or not SKCM Green was the successor of SKCM Brown, which all 6085 keyboards have until 1990.
From what I gather, these are far more unlikely to be found because Xerox stopped marketing the 6085 in 1989, so any boards from the '90s are either replacements for supported customers' systems, or internal Xerox equipment (my theory anyway), which this one was. This came from PARC itself.
So yeah, a huge dent in my wallet, but in the end, I felt like it was really worth it.
The model had some yellowing and like the DocuTechs, its rubber feet all but deteriorated, but the switches and board itself was clean and undamaged.
I want to disassemble the switches and use some molybdenum disulfide to lubricate the slider, tactile leaf, and housing, because, while rare, these switches have binding issues.
There's no dirt I can see in the housings, so I imagine that it has to be the lack of lubricant on the sliders. Once I lubed one up, it was just fine.