Swiss made unknown Pista

As the fork crown was drilled allready when I bought the frame, it became my daily bike. I put functional budget parts on it hoping not to attract thieves too much. Today I keep it in my living room cause I like it a lot and don't want to put it in jeopardy. It must be Swiss made. All the details of the frame are typical for Swiss fabrication. Some of the details are similar to the Sütterlin Spezial 1975 from Speedbicycles. I wonder if the 'itca'-sticker on that bike is the answer. If anyone has some idea about the framebuilder I would appreciate any information.