I just bought a Cherry G81-1800 from ebay. It is black USB, almost like brand new (even come with a manual). However, the key is very hard to press, guess that is what FTSC/MY is about. The board itself is super heavy and feels solid though.
Similarly I have an very old G81-1800 with 5-PIN PS/2, it feels the same. Guess they are going back to ebay soon.