[Dx-qsl] Z31RC/Z35A Postal Zone ?

[Mike Rhodes]

In looking up Z31RC (formerly Z35A ??) I see different postal zone numbers
at qrz.com and hamcall.com:

Skopje, 91000
Macedonia

and

Skopje, 1000
Macedonia

Anyone know which is correct?

Tnx & 73 de
Mike / W8DN