I thought I'd share this with you.
I found GH while I was hunting a mid nineties Acer keyboard of a specific sort and googled myself raw with little to no success.
Of course, the good people gathered here did provide me with specifics so I could actually search for model numbers instead of colour.
And as luck would have it, at the moment when I called off the search, I found that very board online. It was dirty and untested, with no price listed, so I offered ten bucks and the seller agreed. The board came to my home and got a good and deep cleaning (thanks again GH for telling me why the dishwasher would have been a bad idea), but it turned out that while it was the switch model I was looking for, It did not agree with my fingertips as much as I would have liked.
So I took the clean and tested board and offered it on ebay. The auction ended and I sold it with a sizeable profit. That very day, I found a Model M online. The asked price equalled my profit exactly (ebay earnings minus shipping minus what I paid for the acer), so I took it for a sign.
That Model M arrived this morning. A free keyboard. It turned out to be a Lexmark UK made M from May'94 with those double keycaps. I took it apart and found that while it had gathered a fair bit of fluff, it has spent its 26 years of service in a dry environment.

The metal back plate is free of rust and no evidence of liquids entering the board is to be found.
It cleaned up nicely and I just finished putting it back together after the keycaps finished drying (which took long).
The interesting thing is, that while I do know Model M's - I've typed on them when they were just the keyboard that came with the computer back in the early nineties,
I've not had hands-on contact with one in the more recent years. Taking one apart and reassembling it again made me get why there's so much love for them.
When people claim that these are built like tanks and made to outlast time itself, I now fully understand that statement.
The slope in the board, the enormous switches, the fat keycaps, the sheer thickness of the housing - all those features that keyboards have long since shed and probably will never offer again (apart from those nice products for well paying enthusiasts).
Those keycaps - the lettering. How sharp and beautiful it is - even for a new keyboard that has not withstood two decades of sun and fingertips.
I've had a few boards on my bench recently since I became interested in mechanical keyboards, but none did compare to that.
This makes me wonder how a Model F must feel in comparison. I've never thought about getting one of these, because frankly, I cannot do with that layout.
...but I will have to decide what to do with that Model M. I think it's too loud for me to really use, even though the 2 key rollover is not that critical.
I tried the most complex combo I could think of encountering while gaming, shift-walking to the front-right while jumping and reloading in Counter Strike, which would require the keys SHIFT, W, A, R and SPACE to register at the same time, which worked without problems.
Maybe I should stress my luck and sell the Model M to look out for a board with complicated ALPS switches that will appear in an online listing for just the price of what I sold the M for?