I just finished restoring th H412 and I figured it was as good a time as any to post all of these.
The yellow light in the room along with the white background makes all of the keyboards more yellow than they are.
An example of this is the Minitouch, which is NIB and white.
NEC APC-H412:
NEC Blue Oval switches | PS2

Great board that I am starting to use more because I am done with its restoration/remodel.
I love the black and grey look, I am surprised that the grey keycaps did not yellow at all compared the alphas.
Black Space Invaders | DIN

One of, if not, my favorite keyboards.
This is my go-to keyboard for coding because of the split spacebar and amazing switches.
Buckling Spring | USB (via Teensy w/ Soarer's Converter)

Got this as a high school graduation gift from a family friend who had gotten it with his first IBM XT.
Buckling Spring | USB (via Xwhatsit's Controller)

Got this from Cindy and I love it. It weighs a ton and is next in line for restoration.
I replaced all of the keys outside the alpha section with Unicomp keys.
SMK "Monterey" Alps mount switch | DIN

Just got this guy NIB in February for my birthday.
My one problem with the board is that I am afraid to damage the keycaps, so I am waiting for alps->cherry stems to put granite on it.
SMK "Monterey" Alps mount switch | DIN

My only gapped winkeyless keyboard, probably why it is my least favorite.
Also, the case was extremely yellowed so I gave it a second rate plastidip paint job which I will remedy with my new painting experience.
I also wanted to be able to retain the original cables, especially in the case of the Minitouch.
My solution was a little black box running Soarer's Converter with my preferred layout for almost all of my keyboards.
Matching switch photos
Buckling Springs