A very nice 18.11 1811/10 Capped bust half dollar, "The other major variety is an 1811/10 overdate error - which features an 1811 date struck over an 1810 date. The most notable feature in this variety is a dot or period in the middle of the date between "18" and "11" - which resulted in what looks like 18.11 as depicted below in the example image. The dot is simply part of the underlying date"
