I too am really researching into my pups pedigree as I find it thoroughly interesting the history. (I'm currently reading "German Shepherd Dog History" by Gordon Garrett and HIGHLY recommend!)
I spoke with Pam at v. Hena-C and found out that Billie v. Tannenwald was her pup! Torheit's was in TX at the time and imported the 2 DDR males (among many others) that sired Bronte and Billie. So breeding was indeed here in the US and somehow those studs made it out before the dissolution. Very interesting for sure especially since no web searches showed Torheits!
Thank you all who helped offer advice! While Tosca is 100% West German (with founding DDR lineage) the 13 generations since of continued breeding with DDR registered/direct bloodlines i think means my pup is about 99% DDR. 😁