araz
PDF THINK TANK: CONSULTANT
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You maybe right about it being for some other customer. It is definately not a PAF designation.It doesn't follow PAF or prototype serial numbering formats.
The fact that the jet is in China means it could be for another customer.
Myanmar JF-17s had a different 4 digit numbering.
I suspect 520 could be destined for Nigeria as I searched up and it's similar to their AF running series.