This historically significant bit is the first patented (1852) expansive bit known to have been manufactured. It is considered rare. It was invented and manufactured by Charles L. Barnes of New York City. It has a range of 5/16” to 1/2”. Two other sizes, 1” and 2”, were made.
I acquired this bit about a year ago for $3. It was very junky looking, but identifiable as an expansive bit. Nobody thought to identify it at that time. That took some recent on-line research. Other than the patent listing, there is an article, which includes this bit, by Eric Brown in the E.A.I.A. Chronicle, March 2019.
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