Wow! What a looker! One thing you'd have to look out for as for as his progeny goes, that if they look anything like their dad, people like me might just show up to steal the puppies! So . . . be careful!
I know and have talked to the previous owner of Nando. He trained Nando to the BSP. Nando was a pure DDr dog and at the time he was born, the East Germans were basically holding a fire sale on their dogs. West Germans and Americans were going to the DDR and buying up GSDs by the dozen. Nando's owner is a very knowledgeable dog person and he tested over a hundred dogs before he picked Nando.
He said it was a lot of work to bring Nando to the BSP, more work than a good West German line dog, but then DDR dogs were never bred to be sport dogs. He'll also admit that Nando had such nice color that it was also a factor. Yes, even working line people do care for looks.
DDR breeding was oriented toward producing show dogs that could work. Work being defined as tracking and herding not dog sports. Essentially the same philosophy that West Germn breeders had in the 60s before the lines bifurcated into show and working.