This stone with unknown cuneiform was found in Karmir Berd ( do not confuse it with Karmir Blur ) site. In Early Iron Age layers (1100-850bc) at the foundation of cyclopean fort.
It was first published in 1976. Later two other similar inscriptions where found. One from modern Armenia the other from Nakhichevan region of Azerbaijan.
The cuneiforms are different from Urartian one and in most likelihood are based on alphabetic system rather than syllabic.
Artak Movsisyan assumed that it was an alphabetic writing system invented by locals. Other known alphabetic cuneiform systems are the Ugaritic and Persian. But this one is not related to them.