This is the Lenovo KB1021, also known as the Lenovo SK8825 or the Lenovo KU0025.
This particular one is a Lenovo KB1021 that was manufactured in 2014-08-29 with REV number V01.
The keys on this keyboard is very snappy and the tactility of the keys is perfect! It is like stepping on a crunchy dry leaf but the crunch is like happening inside a cloud. It is euphoric.
I am happy to say that I have finally found my endgame keybaord, and it is not a mechanical keyboard