I'll have to check my records, but the Stupice seeds were either purchased from TGS or Tomatofest. I also thought they were the wrong shape for Reisentraube...they are more rounded and these are elongated not quite grape shaped though. As for clusters of blooms...that's their behavior...the one pic doesn't do it justice, but there are close to 100 blooms I'd say in that one cluster.
The flavor is excellent though, so no complaints there!