New guy with brush question

I have a brush that I have had for years and I inherited from my grandfather. I would like to know more about it and I was hoping that someone could point me in the right direction. The brush is labeled "dubl duck, M-2, professional use only, made in Germany". The handle appears to be aluminum, and the bristles are very soft and blond to orange in color, almost like human hair. I would like to know what the bristle truly is, if it is still made today, and if there is anyone else making them. Also, can I coat the aluminum handle, or replace the handle?

Thanks in advance