Beginning about 1847, a brass frame called a 'preserver' wrapped around the taped assembly.
This complete package was then placed into a wooden or thermoplastic case for protection and presentation.
The preserver was first used around 1847, and it became a standard part of cased images.
The preserver is a brass frame that wraps the glass, mat, and image.
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The Daguerreotype in America Once the daguerreotype process was published in Paris in 1839, it spread rapidly to America.
Mats give us some wonderful clues as to a daguerreotype's (and ambrotype's) original date.
They changed significantly about three different times, with lesser evolutions along the way. The earliest ones had a 'pebble-like' texture, and were usually octagon or oval up to about 1845.
It exhibits the characteristics of a mirror at many angles.
Once you have determined that your image is a 'dag', several clues can help establish a date range.
Early daguerreotypes were protected by only a mat and glass, and then placed in a case.