John,
I agree that typically distributor marks are only the name of the shop & sometimes the location as well. Very rarely do we see some sort of stylized logo, as we see with Linnenbr�gger & Ellermann, Bielefeld fire bayonets.
Just looking at the blade mark with nothing else to go on, it would be easy to think that the mark was that of a previously unknown manufacturer but we know that even small cottage-style makers had enough product out there so that the firm itself likely would not be completely unknown. This type of mystery is usually reserved for these obscure & very local retail outlets.
Very cool dagger!
