I don't think they're gateron dyesubs
uses stepculture2 profile, so more along the lines of leopold 750R pbt keycaps but with dyesub
although stepculture and cherry profiles are quite similar
so in terms of quality for base, pretty much this: http://www.ebay.com/itm/PBT-Keycap-Set-for-Cherry-MX-based-Leopold-Keyboard-Front-Face-Englih-Black-/272166685744?hash=item3f5e660c30:g:Z2YAAOSw91NTttVa
same thickness, so I'm just gonna assume they're the same
Show Image
(http://oi63.tinypic.com/343hds5.jpg)
Doesn't look the same as Leopold on the underside, so I'm gonna say Varmillo would be a better guess. Judging off the picture there's a few differences.
1. No markings on the underside with a code.
2. No 4 small raised circles in the 4 sections on the underside.
3. Leopold and Gateron has this weird recess under the stem that's not there.
4. Leopold usually has a small almost non-existent cross bar on the top and those look like they have a longer one.
http://duck0113.tistory.com/133
Anyone know anything about these caps? Duck says they are BEST keycaps :P
Surely though the don't have as good a texture as OG dyesub or bsp even.
You could ask getf (https://geekhack.org/index.php?action=profile;u=44299) about them, he's got a couple sets and posted about them in a thread https://geekhack.org/index.php?topic=81553.msg2150031#msg2150031. Not sure if he's got other PBT sets to compare to though.