Thanks for a good link.
I was glad to learn that prices of 2009 colored Ox silver unce coin is raising recently, I had the opportunity to grab two coins in 2010 and could not find any auction on ebay since then. People surely know that this specific coin mintage is destined to be diluted into two different series since it ends one series starting in 1998 and the at the same time starts a new series of the stylized secession-like design. For me it is actually the
coin with the highest potential starting from 2000, followed by Grotto series.