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OK, here is my Bengall Cast steel from Thomas R. Cadman & Sons, Sheffield. To my knowledge, the Bengall brand was first registered by Luke Cadman in 1748 and used until the company's closure in 1965. The hallmark "Cast Steel" might indicate a production before/until 1855, because later in Sheffield mainly "Silver Steel" was used. Mine is a 6/8" near wedge.