It actually had the seal of Erzgebirgskreis, so I assumed it was an optional reissued code. Now I guess it is genuine old Annaberg since it was photographed previously in 2011!
Btw, did you mean the seal or what was written under the seal? Because the seal is the same on every plate given out in Saxony.
Yes definitely under the seal. When I saw it I remembered that Annaberg had not long ago been abolished, so it could have been either old or reissued. Because of this I made sure to check.