This is a collected and well established Austrian black pine, Pinus nigra Austriaca. It was part of a trade yesterday. Apparently noone other than me wanted it. This is a nice tree with an interesting big knob in the trunk. Or is it just ugly? After closer inspection it looked like a spriraling trunk which has built this knob after many years.
So the remedy was to enhance the spiral and at the same time not disturb too much the sap flow. Here the result after 30 minutes work. I am definitely sure that the pine will not mind much and become a very nice elegant bonsai eventually.