Although I am still waiting for the key picture in this regard to upload>>>the raised dot style border>>>>>>>
I can assure you that I have the definitive artefact in the bag! A tile from the MASOUD III PALACE in GAZNI Afghanistan in precisely this style> This was found to be pre Islamic Iranian ...the building was occupied up to 1221 but sacked by the Mongolians. The publication containing the item is shown below and is a British Museum publication.