After many attempts at trying to get this right i'm now onto my best method so far...this WBW rosette has 3 staggered joints but it's difficult to see where they are...on this soprano the black one is at about 4 oclock
These are the sorts of things only the maker sees. Or looks for. Pretty darn seamless. However getting out the magnifying glass I believe I can make out a joint at the 11:30 position. Such sloppy work!