i was in GZ market few days ago , it on Haizhu Zhong Lu # 188 , very poor very poor market.most of dealers selling paper money and stamps. i saw some 1 oz pandas but most resealed or with white spots..
prices compare to shanghai market is also high...
Many rare coins is hiding by dealers. If you need a rare stuff you need connections or how chinese said "Guangxi". some od coins are resealed even have a fake COA.
but Jumen lu is a heaven for MCC !