Then around 1859, the mat material became much thinner and complex designs were stamped into the metal.
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.
The puritan-look of the early 1840s gradually gave way to some rather flamboyant styles of the late 1850s.
The best way to understand is to view the wide variety of images in the gallery.
The preserver was prone to breaking at the corners.
In about 1859, preservers with reinforced corners and more elaborate artwork were introduced.
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