Tjabo: see below for the lugs. The BB shell (68mm ISO) is smooth/clean underneath, no numbers, cutouts or anything.
Only characteristical thing are those three holes near the seattube (plus another three near the downtube)
Hmm, those lugs look even more intricate than the Zeus ones:
I thought they looked simmilar in the prvious photos. And Zeus bb shells typically have two slots like this: Although there are exceptions. So its probably not a Zeus, sorry.
Do you have any close ups of the lugs and bb shell? Looks like it might be an actual zeus frame.