Burguk's Longhouse Cellar in the Orc stronghold Dushnikh Yal. It is on a shelf facing away from the ladder.
This item can only be found here and displayed in V5 or higher. In older versions it can be located in Birna's Oddments in Winterhold and does not have a display in the Gallery.
Burguks' Cellar, Dushnikh Yal
Knigts of the Nine Plate location