Is there an actual family crest, sigil or flag for the Wachter Family? I do know they use the colours yellow, red and blue, but I can't find out what it would look like.
Judging from the guard uniforms the yellow appears to be the primary colour, with dark red for the borders, so I am speculating that blue is used for the details?
Either way I haven't found any canon source that reveals what the actual crest looks like, but am I correct in guessing it might be based off of the image below?
It is apparently the sort of crest associated with the slavic Wachter noble family surname, according to sources from google. Might just be a strange coincedence.