Dear @Ines,
Thank you so much for the tuning chart. I have found the same at https://web.archive.org/web/20170621222229/http:/www.playhohner.com/instruments/harmonica/historic-collection/echobell/
BTW, Because it is my first and only tremolo harmonica, I was quite confused that holes are doubled, for example, 1- 2- are the same G. That’s why there are only 7 columns in the chart while there are 14 columns in harmonica.
And they aren’t marked somehow. I found very inconvenient to play on it. 
Best regards,
Maxim.