1866 Sydney Mint Sovereign

How often does an MS62 Sydney Mint come up? I've only had a handful in the last five years. Make no mistake about it, they’re tough. Many of the so-called “Uncirculated” Sydney Mint sovereigns that are raw often only grade AU58 when they are sent to PCGS (see my 1859 Sydney Mint graded PCGS AU58. This coin was graded UNC when it was raw), so to get one in Mint State (and Mint State 62 to boot) is a real coup. Scarce this nice, with only three finer (September 2013).