I have some information about your grandfather... Some years ago I was at "Fretex" a second hand shop here in Haugesund, Norway. There I found a lovely black and white drawing of 2 ladies sitting by the piano. I loved it so I bought it, and it is now hangs in my livingroom (my daughter wondered who he was, so we googled him and ended up here!).
On the back of the drawing there is this handwritten info: "Harald Jordan Født i Bergen 1875, og døde i København 1955. Kjent for sin elegante strek. Nr. 3 av 6 kopier."
If you would like a photo og this picture, please give me your email adress.
Regards Aud Marit, Norway