Oremus, that's correct, although the icon in question is of Eastern tradition and was preserved by the Patriarchates (Antioch or Jerusalem I guess), therefore being a symbol of "Byzantine Theology and iconography", as well as of Orthodoxy.
Byzantine Iconography is not exclusive property of the Orthodox Church. I mean, if you are Orthodox I understand why you would say that but as a Catholic we believe iconography in the Byzantine Rite pre-dates the AD1054 schism so it's property of the Catholic Chuch and part of her treasures. ;)
It's not an Orthodox icon. It is a painting of the Divine Mercy as painted by an artist in 1934, at the direction of a Roman Catholic visionary nun. There's a whole spirituality, from private revelation, and way of life around this.
The polish Roman Catholic nun was Sr. Faustina, now long declared as a saint. The feast day of the Divine Mercy in the Roman Catholic Church is the Sunday following Easter Sunday.
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