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Rectangular with one bolt; knobs missing; painted black; A = keeper; edges are slightly molded.
Cast during manufacture on face: ""CORBIN Patented Apr 2 1878""
Corbin Manufacturing Company (Maker)
New Britain, CT, USA
5 x 8 x 1.125 (HxWxD) (inches)
Gift of Mr. Warren H. Manning
Connecticut (United States)