And he also put into the hat certain schoolboy treasures of almost inestimable value—among them a lump of chalk, an India-rubber ball, three fishhooks, and one of that kind of marbles known as a "sure ’nough crystal."
There are no more uses of "inestimable" in the book.
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jewels of inestimable value
a right inestimable to them
Thomas Jefferson et al. -- The Declaration of Independence