Carol --
There is a Gold Seal registry and a World Class registry. However, in my opinion and the opinion of most miniature horse owners, they are both totally worthless. The only "real" miniature horse registries are AMHR and AMHA.
Not only that, but World Class has the worst customer service out there. Lots of people have paid for papers that were never received. At one point, I used to send horses to their annual show, and for that reason, had WCMHR papers on all my horses (in addition to their AMHR and AMHA papers). However, I got so disgusted with their business (and it is a business, not an organization) that I threw all those papers away.
From my perspective (and the perspective of most if not all serious miniature horse people), a horse with ony Gold Seal and / or World Class papers is actually a grade or unregistered horse. If I bought a new horse who had those papers along with the real AMHR / AMHA papers, I would throw that horses Gold Seal and World Class papers in the trash just like I did with the others I used to have.
Jill