In November 2015 Ebay seller rtcwx from Bremerhaven in Germany was trying to sell this, unused sample plate. It is from the 1992 series and the G should indicate the county code. There is no county code G, there were no vanity plates in that series and KGB would be a banned registration anyway.
It is either a manufacturer’s sample with a wrong or impossible registration or a fantasy plate made as a joke of some sort.
Be very careful what you buy and check before bidding that the plate is real.