[Doggydog]

You're right, GSD's are not supposed to be this large. Although it's not uncommon to find them.
I came across some extra large GSD's being bred near me when I was looking. Initially I wanted an adult and there were none in rescue in my vicinity. I got a retired breeder from someone whom I won't mention, they were actually very nice people. Their males were very likely in that weight range you mention. The female I got was 110 lb bicolor. Beautiful. But way too big for breed standard. We had to return her after 3 days because she hated my other dog with passion. Poor Coco would yelp and whimper at the mere sight of the giant bitch. The giant went after Coco a couple times, lucky for Coco she's got gobs of fur. The final time she lunged for Coco she missed and bit my daughter in the leg. That was it. Even though she loved my daughter, she was out to kill Coco and hurt anyone in her way.
After that I found a normal size puppy.
The giant female wasn't mean because she was large, I didn't want to imply that. Just not properly socialized I guess. I'm really glad I returned her and found the right dog. Mine hasn't been on the scale recently, but I think about 70-75 lb at 1.5 years.