Pitch Pipe

This is called a chromatic pitch pipe and it is used to give the correct starting note to singers. I inherited it from my father who probably acquired it in the 1920s or 30s. For Tiny Tuesday with a theme of music, this is the smallest musical instrument I could find. On zooming in, I discovered that it uses the German musical notation, so that B flat is B, B natural is H and F sharp is Fis. Nowadays, there is probably a mobile phone app to do the same job. But would it last as long? Thanks to MaryElizaR for hosting.