That's very interesting Frank. I assumed Zagreb had something to do with a Fisher era tournament there.
there have been lengthy discussions about this in the past here, and nobody has been able to produce any photographic evidence from any tournament of a set that the "Zagreb" is based on. I could be wrong, of course, but I'm pretty sure it's because there is no such set. HoS calls it "a stunning reproduction of one of the most popular chess sets used in the major international Chess tournaments during the 1950s and 1960s" but they have never shown any photographic evidence of that supposed set either.
Mind you, it doesn't particularly matter, and invented provenance or not, it's a good-looking set.
That's very interesting Frank. I assumed Zagreb had something to do with a Fisher era tournament there.