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What's interesting is the title Esq. which most often back then meant lawyer. At least that's what I was led to believe.
You raise an interesting issue. You're right about the title "Esquire" being used for lawyers, but depending on what time period is involved (and what country) the title had extended to others, too.
In the case of the biographical clip about "Washington Chase, Esq." it may be that he was accorded that title because of his service as a Justice of the Peace.
An interesting study on the subject can be found here. Note the final paragraph:
http://www.legalgenealogist.com/blo.../09/esquire/Edit:
One final thought on the subject: It could be that the writer who addressed the cover had mistakenly included "Esq." in the name, incorrect though it may be.
Another reference suggests that the use of "Esq." is usually done by someone else and is not a title that a person typically uses to describe himself. An analogy is given as to how a Judge does not call himself "The Honorable" or "My Honor", but a person addressing a Judge would properly use the terms "The Honorable" or "Your Honor".