Up for sale is a very rare China 1910 Sinkiang silver Sar/Tael L&M-813 Y-7.1 PCGS XF45.   PCGS graded 11 Y-7.1. NGC graded 21 Y-7.1.  Sinkiang coins are very hard to get high grade.  there are not too many Sinkiang Sar/Tael out there.  A Y-7 MS61 just sold for 14.340 in March 29, 2015 Hong Kong Auction.