According to the Heralds, the only persons who should display the arms of An Tir would be Their Magesties. In some cases, displaying the kingdom arms by another person, such as one who bears Thier Magesties authority or warrant is also permitted.
In addition, it is typically considered acceptable to display the kingdom device in a mundane setting that advertises the Society and/or the Kingdom such as on a bumper sticker or on advertising media, so long as there is no implication that the person displaying the device is the owner of it.
I am making the items in this section available to the General Populace for such things as presentation of Largess and the like. Please consult with a Herald if you intend to wear or display these items yourself.