Seems like a bug. I know I have not received any rare 'knot' curio bow pieces as have others I have checked with.
Was it really the intention to have people buy bows without the chance of getting rares? Can this at least be part of the fix for the gold and plat stockings? Making the bows in gold and plat stockings knots would balance out the other presents not having any.
You tell Wyrden Ravager Tarken, "Come to Gaudiguch. I'll give you the title of Grand Moth."
Eyes peering skywards as he thinks, Ironbeard the Magnanimous says to Sksez, "Welll, on my gooD lis *hic* t, we have....Stei *hic* ng *hic* rim.U..Xypherv....Luu *hic* hghaigh *hic* hhe....Breandryn....."