Wow, nice encounter, I doubt their will be many OM experts in this forum, and actually only few who ever heard about the marque in the first place, so for the time being we can assume that your assertion about model and year of build is about correct. Apparently the car is in full running order with a Zurich license plate, so it will probably appear regularly on classic car venues in Switzerland.
"I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams