So here's to you, Jim,
And of course to lesser mortals - I like Brian's expression!
This I photographed at the British Museum London in 1997. The blade is struck on the forte with an unidentified maker's mark similiar to those used by medieval stonemasons, and two crowned Pi marks.
Please note the pierced Gothic quatrefoil (
Vierpass) decoration at the ends of the quillons which also accounts for the dating "early 16th century".
Michael