Here is an interesting example of the single millrind mark - on the same blade appears the "Passau wolf". The sword is suggested to be Italian, being exceptionally similar to one in a well known painting... So should we suppose this is an example of a contemporary faked Passau mark? Or perhaps the millrind is indeed not a personal maker's mark, as I think was suggested above...
https://www.metmuseum.org/art/collec...=80&pos=41