Estimated grade. Sold by B. Max Mehl Jun '41 price realized $4.2
Ron Guth: The 1843 Quarter Dollar is typical of most dates from the 1840's -- it is scarce, but not rare, and can be found in Uncirculated condition with patience and luck. None of the mintages of any of the Quarter Dollars from the 1840's exceeded a million coins, but the mintages were healthier than those of other decades (especially those of the 1860's and 1870's).
Mint State 1843 Quarter Dollars appear most often in MS-63. On either side of that grade (both lower and higher) the populations drop quickly. As of September 2011, PCGS reported 32 Mint State 1843 Quarter Dollars, the finest of which are two in MS-66.