Thank you, Црна Гуја! I hadn't realized it was so rare...Interesting...
Below I am copying the comment of this very helpful user on Anthrogenica plus an addition made by another very helpful user :-). It contains some info about the Greek cases too:
So in the FTDNA J1 Project’s tree, PF7263 has two branches, ZS4376 and Z28138.
The ZS4376 is estimated to have formed 3,460 years ago.
There are no cases with only ZS4376; instead there are two further branches.
One is ZS8957. That case is German.
The other branch of ZS4376 is ZS4407. ZS4407 is estimated to have formed 2,998 years ago. There are no cases with just ZS4407; instead there are three further branches.
One is ZS4375. That case is French.
The second is ZS9949. ZS9949 is estimated to have formed 1,758 years ago. There are no cases with just ZS9949; instead there are two further branches. One is a German case, the other is a Croatian case.
The third is ZS10589. ZS10589 is estimated to have formed 2,975 years ago. There are no cases with just ZS10589; instead there are two further branches. One is a Ukrainian case, the other is a Saudi Arabian case.
Besides the extensively tested cases in the tree, many cases which look similar are grouped on the list at
https://www.familytreedna.com/public...frame=yresults. If that clustering is correct, PF7263 has:
— an English and German cluster
— a German cluster
— a Greek cluster of only one person (Yavit of Davut Thessaloniki)
— a Kuwaiti and Iraqi cluster
— an Iraqi, Turkish, and Azerbaijani cluster
ZS4376 has:
— a person named Sliwinski from ?
— a German and Canary Islands cluster
— a French cluster (just one person)
— a Bulgarian cluster (just one person)
ZS9949 has a cluster of German, Croatian, and Bosnian Herzegovinan cases
ZS10589 has:
— a case Maragoudakis from Sassalos Crete
— a case from Spain
— a cluster with cases from Portugal, Ukraine, Lithuania, and Russia
— a cluster with cases from Calabria, Germany, Ukraine, and France
— a Saudi and Yemeni cluster
+ You also have Venardos from Agia Anastasia on island Kythira. he is considered J1 PF7263 cluster D. Main difference between him and Maragoudakis is in DYS390. Maragoudakis have 24 and Venardos 25.
The Alpha-Beta panel sounds like a good deal! So, do you think that it can really result into something more specific (as in a specific branch of J1 PF7263)? I am still waiting for their answer to my e-mail, hoping that they do respond to such inquiries, of course.
Thanks again! Hvala! :-)