Qwan Yin??..Extremely Old Stone Sculpture from the "East"

I have lived with this "Religeous Artifact" for my entire life.  It was brought to America sometime prior to 1940, I imagine.  Grandpa was the Vice President of Coca-Cola International Marketing for the East.  He was stationed in Hong Kong, but traveled extensively, so I am not certain of origination.  But, as far as I can decifer, this is a Qwan, or Guan Yin Sculture, and of the Finest detail that I have seen over a year of reseaching.  And, it is of a Very Hard Stone, most others are Sandstone, and the wear is very prominent on those.  This is the only one I have seen that is in such detail, and with this Hair style.  I am interested in selling it if the price is right.