An EDS is merely a descriptive term and adds no premium unless it is a rare die state. I personally prefer more EDS as type coins, because they have full dentils, usually stronger in strike, and the details are sharper.
You are correct in that there is an O-110a, but that isn't the case for every marriage. This particular marriage turns into the "a" die state when a die chip appears in the 3, creating the "ugly 3".
The doubling on the chin is just a cool factor with no premium because they are most common in 1823. It is called a doubled profile, and caused when the planchet or die shifts in the striking chamber. Extreme examples of the doubled profile could have the potential to have a premium.
Suffering from bust half fever.
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