Hello,
I visited the Pergamon Museum in Berlin and I found this inscription, which shows an interesting form variant of the Ω and also of the Φ (it has a long ascender and long descender):

Does anyone know something about it, especially the playful omega?
Also the O looks a bit lowercase.
Comments
@Lukas Horn As Andreas Stötzner mentioned, this inscription probably comes from the Greco-Roman period. I have seen this form for Omega in a couple of modern day typefaces. Mantinia Greek by Matthew Carter is one of them. Carter also calls it “Imperial” on the publication the picture bellow comes from:
Here’s another funny looking Omega, found on an inscription at the Roman Agora in Athens:
I must say these forms are rather extravagant