1806 $5 BD-6, Knobbed 6 AU58 认证号09808131, PCGS号45620

In 1806, engravers at the Philadelphia mint used two different "6" punches when creating the dates on Half Eagles.  On one version, the top of the 6 ends in a point; on the other, the 6 ends with a ball instead of a point.  This second version is known alternatively as a Knob 6 or a Round 6 (PCGS's preferred nomenclature).

 

Only one die variety was made with the Round 6, this being BD-6 (Breen 5-E).  This is a relatively common variety and hundreds (perhaps over a thousand) have survived to the present day.  At least two hundred have survived in Mint State and these are usually found in MS62 or MS63.  In MS64, this variety becomes quite scarce.  In MS65, the 1806 $5 Round 6, 7x6 Stars is a great rarity, with only three known -- all of which has made their own individual appearance on the market since 2010.  The record price for this variety is $126,500 for a PCGS MS65.