Four examples are now known of this great rarity, thanks to the discovery in early 2012 of a new example (certified VG8 by PCGS and illustrated above. All four 1853-O No Arrows Half Dollars are from the same die pair. Each is below the old standard weight of 208.25 grains, but well above the new standard of 192 grains adopted on February 21, 1853. The wear on each of the known examples accounts for the weight discrepancy.
This was the second-to-the-last coin that Louis Eliasberg needed to complete his collection of United States coins.
In a survey of the members of the Liberty Seated Collectors Club, published in the March 2008 issue of the Gobrecht Journal, the 1853-O No Arrows Half Dollar was ranked first among the Ten Greatest New Orleans Seated Coins: "...This issue was placed in the top spot by 55% of the respondents and was listed among the top ten coins by 86% of the respondents."
Sources and/or recommended reading:
"Lost In Transition" by Paul Gilkes, COIN WORLD, July 24, 2000, p. 80.
"The Ten Greatest New Orleans Seated Coins" by John McCloskey, THE GOBRECHT JOURNAL, March 2008, pp. 53-57.