You are blessed to have a replica of that 7 post Menorah. From all that you wrote concerning it, it fits the description of the one that was taken by Titus back to Rome. I, too, wonder with you, in whose possession is it now. I know that Israel had written a letter once again, this past year, demanding that the Vatican return all of the Temple Vessels, etc. that were carried off after the destruction in 70 AD.
Be blessed in your precious memories,