@Psmith
To me your Americana certainly looks more like a 3 band than a 2 band. If you look at the stock photos on the Shavemac website the knot is distinctly a 2 band knot.
I agree that some 2 bands show an additional band under the dark band based upon the way the knot has been set in the handle (I have some 2 bands that definitely show an additional band under the black band but it is generally not a lot and not overly prominent)
Compare yours to the Colonia 3 band and they look more identical than the Americana 2 band in the first picture.
Your brush:
Colonia Silvertip D01 3 band (stock photo):
Remember that there is a language barrier with Bernd (unless you speak German of course) and this may cause some confusion.
@alfredus does speak fluent German and I am sure he would be happy to help you out if required (I would also be interested to hear his thoughts on the above).
Please don;t take me the wrong way either I am not in anyway saying that there is anything wrong about your brush or anything of that nature. Once you get in to the Shavemac D01 knots I don;t believe that you can go wrong with either a 2 or 3 band brush.