Google helps me every day – why should I not help Google? I searched for a tuba with six valves – because I have found this Danish post card with an odd instrument like that. None of my books could show me something similar – and Google Images could not help either. So here are a seldom picture. If I should guess from which year, I think it could be around 1925, when my own father was a soldier. But – any other opinion should I welcome!