I suppose if people are taking collecting my coins seriously, I might as well point out that the series 1 coins were made and distributed in prefix order, with 11xxxxxx being the first, 12xxxxxxx being next, etc. The lower the number, the earlier the coin.
And interestingly all of the higher priced coins are 13xxxxxxx 14 and 15. I have not seen (though some numbers are obscured) a 11xxxxxx or a 12xxxxxx yet go on ebay.