I wanted to add this example to the record here. Recently sold at Herman Historica auction #70. The guard is very similar but slightly lighter in design. Interestingly, the hole in the pommel that is normally used to secure the base of the guard to the pommel appears to have been filled in. It also seems that the pommel has been rotated 180 degrees at some point. It does appear to match the rest of the sword though.
http://www.hermann-historica.de/db2_en/newauction.html