Received this cover back from Greenland the other day. The "Santa Claus" cancel was available at the Greenland Post philatelic center during December 2009. I sent this to them sometime around the end of October. The cancel says 31 December 2009 and it arrived in Canada on 4 May 2010. So where did it get held up? I suspect it didn't get cancelled in Greenland on 31 December but instead was either delayed getting there or was misplaced and actually cancelled much later - perhaps even a few weeks ago. Mail between here and the east coast of Greenland can be a little slow in the winter but it's not usually that slow. At least once this year I've purchased stamps from Greenland Post and they arrived within a month of placing the order.