There is information on the Internet about granting a license to use markings on replicas of Heckler & Koch products. Through Umarex and Umarex USA, the license would be granted to Specna Arms, so that the full markings will appear on the H&K rifle replicas. At the moment, the H series replicas will probably have them.
We can only guess whether the G series replicas will also have markings or whether Specna Arms intends to introduce other models from the HK family to its offer.