I think this haplogroup is very interesting because it contains one branch (Z40772) that has Scots, Italians, Swedes and Armenians descended from a man who lived 600 BC.
I don't think it is yet clear whether the Late Bronze Age origin of CTS3601 is Central Europe or Italy. Perhaps participation in population movements relating to the Bronze Age Collapse, Celtic expansion and Roman Empire have obscured an otherwise simpler distribution.
In this case a man living in 1100 BC had, before the year 600 BC, six different lineages. Five are represented on YFull by the following living descendants: a Bulgarian, Swiss, German (BW), Italian, Spanish-Dutch, and intrepid Y24651 from Italy to England, Central and Eastern Europe and Armenia.
The fact that Y24651 sired so many offspring in 600 BC more closely matches the timing of the Celtic expansion than the Romans. However unless the Armenian descends from a Galatian Celt who had migrated to Turkey (this seems a stretch), a Roman Empire-mediated migration to Armenia seems more plausible.
We will have more information to work with when:
1. Additional samples are found under FGC21085 that will point to its origins as Eastern or Central European.
2. If the Sardinian sample's ancestors can be determined to have migrated to Sardinia with Ligurians vs Romans or later
3. More is known of the Armenian sample's paternal origins
4. An Old World paternal origin can be ascribed to the American samples at FGC58752