The Acer keyboard might be a 6311. It looks to me like the "reverse curve" one listed here :
https://wiki.themk.org/index.php/Acer_6312
I don't have any Acer keyboards myself and the wording on that sticker looks somewhat damaged so I might be wrong. However, you might be able to match up the features on the back of your keyboard with some of the pictures in that link to figure out what you have.
The switches on the Nan Tan 6251LN look like Alps clones to me. Possibly one of these :
https://wiki.themk.org/index.php/Alps.tw_Type_OA2
https://wiki.themk.org/index.php/Xiang_Min_KSB-N
The 4 tabs at the end of the switches in your picture and the numbering on the switch housing are usually an indication that the switch is a clone. Genuine green alps are linear
NTCs, and the 6251/2 in particular are a bit of a switch lottery. They come in a range of switches and it's hard to tell what you will get until you pop one of the keycaps off. Here is a bit more info on them :
https://wiki.themk.org/index.php/NTC_KB-6251
IDENTIFY THE KEYBOARD thread
-
wedgeoflemon
- Location: AU
- Main keyboard: AEK II
- Main mouse: Logitech G305
- Favorite switch: Orange alps
-
Peter_Cantrope
- Location: Ukraine
- Main keyboard: Chicony KB-5181 "Monterey" blues
- Favorite switch: Monterey, want to try optical switches
- DT Pro Member: -
Thanks a lot, pal! I think you're right!wedgeoflemon wrote: 13 Mar 2026, 23:55 The Acer keyboard might be a 6311. It looks to me like the "reverse curve" one listed here :
NTCs, and the 6251/2 in particular are a bit of a switch lottery. They come in a range of switches and it's hard to tell what you will get until you pop one of the keycaps off. Here is a bit more info on them :
The Acer is 6311 with that elegant bend at the top and 2 sets of feet. The switch is Acer. Large keys rattle quite a bit, but overall, the switches feel pretty decent; the tactility is pleasant. The keyboard is reasonably small, I could find a practical use for it.
It's a pity that the bumps on the F and J keys are tiny little dots in the middle, and are almost impossible to locate without looking.
The green switches in the NTC are linear. I did not fall in love with them after the first stroke, though. They're very stiff. I'm not sure I like stiff linear switches that much. And they are certainly not Alps.
But the keyboard is quite clean, and all the keys are working.
I will disassemble both keyboards and give them some love when I have time. It's been more than 5 years since I bought my last "old keyboard", so I'm very happy with these two
