I dug out my old Vivarium magazine [ Journal of the American Federation of Herpetoculturists, no longer in print ] In an article from 1996, Vol. 7, # 6, written by Bob Mailloux + Phillipe De Vosjoli....this is what it said about G.G...." A size morph imported from Germany and offered by breeders such as Pete Weiss. They attain a large size + can produce clutches up to 68 eggs. Males can sometimes exceed 24". The article also mentions that they are a p.vitticeps, not a cross. And the book " General care + maintenance of bearded dragons " by the same authors mentions that p. barbata [ Eastern bearded ] is a different morph can sometimes reach 2 feet. At the time of the writing, there were few in U.S, collections, they were not easy to raise + had a slower growth rate. The hatchlings that came from cross breeding p. barbata with other pogona were weak + did not do well. As for the writer [ Bob Mailloux ] , developer of the famous sandfire dragons, he is known around the world as the one who really introduced the majority of color phases existing in the hobby today. [ If you Google his Sandfire dragon ranch, you will see how long he has been a breeder + what impact he had on the hobby ] But Pete Weiss is reportedly the one to introduce the German Giant in to the hobby, they were in the 22-26" inch range and very large dragons today probably and possibly carry those genes.