Found it on ebay! Daughter inhereted it from her father who died two years ago and originally bought it in 1992. She offered it with bad fotos and a "horrible" wristband for a relative high price. It was on ebay for over 2 months. I contacted and offered what i was willed to pay for it. We agreed on a price and i visited to inspect. I was surprised what i found. Original inner and outer box. Original papers (incl. cash receipt) and coherent numbering. I bought a new leather wristband yesterday. And here we go!
The Constellation saw an Omega service some years ago. They told that the dial is ruined and a replacement dial is not anylonger available.