@ blondie
unfortunately no, however if you use a mobile device and pinch zoom I may be able to describe for you where to look.
Looking at the uppermost portion of the ring you see a darker dimple, which is matched by the left most portion. Im wondering if these two dark dimples are not the ends of the cross key symbol - the circular ends one would be holding (see image above), these then cross in the middle and on the othe side if you look closely you can make out what appears to be a square off of each cross line toward the middle, which I think might be the actual key portion of the cross key symbol which would go into the door.
as for the 41, this is because I can't tell if the slant I'm seeing on the upper right side of the ring in that photo is because of the ring or part of the engraved groove.