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inscription: ‘A.P. Critchlow & Co.,/ Manufacturer of/ Daguerreotype Cases./ A.P.C. & Co./ Are the original inventors of the/ Composition for the UNION CASE,/ (so called,) including all the various shades/ of color and fineness of texture pecu-/ liar to their manufacture and of the/ Embracing Riveted Hinges, thus/ securing them from breaking out/ as do other that are inserted/ with or without a/ metal brace./ Hinge patented/ Oct. 14, 1856 & April 21, 1857.’