GBCA is a chinese coin and banknotes certificate like PCGS and others.
it is good at china. but not famous as PCGS. at china GBCA is ok.
this is a famous hongkong gold shop porduct's gold sycee. chinese love old shop.
i got this coin last year. this type coin is my first chinese dragon coin.
chinese coin too much copy, so if you love ,when you bid need careful . some copy are good.