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The Italian linguo-cultural elements in Istria are merely a vestige of what they once were, the street signs you are talking about are a mere formality.
Many of the students in the Italian schools are actually children of immigrants from Bosnia who wish for their kids to learn Italian so they can send them to study abroad, and the way they speak it is anything but fluent, although you are right by saying that the (older) population speaks Italian.
But the Venetian colonists are mostly gone, they've been displaced several leagues either west or below ground.
One of my ancestors actually was a Lombard from Varese who settled Koper, although it is such a distant ancestor in my case that it's completely irrelevant.
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