Serial Number 533?

Serial Number 533?

NGC hosed the certification label on this beauty. I purchased this so called dollar sight unseen based on the NGC grade MS64 RB. The certified HK-533 so called dollar does have a low population and an original mintage of 250. When I received it , I was disappointed that the owner never had it corrected. How can a mintage of 250 have a serial number of 533?