Norfolk latch
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A Norfolk latch is a type of latch, or mechanical fastener, incorporating a simple thumb actuated lever and commonly used to hold wooden gates and doors closed. In a Norfolk Latch the handle is fitted to a backplate independently of the thumb piece.1
Introduced 1800 - 1820 Norfolk latches, originating in the English county of the same name, differ from the Suffolk latch in the inclusion lack of a back plate to which the thumbpiece is attached.
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