mystery find

[Raoul]

Hi every one this morning i found this 4x3 inch solid copper plate,etched on it is a pic of a guy i would say in the 1800's or early 1920's has anyone an idea of what it is?
My idea is that it has something to do with printing or photography. Raoul

 

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Maybe a Ferrotype or a calotype or a Dauguerreotype. Looks like from Fox Talbots time around 1830 to 1839. Since it looks like a negative tintype is my guess.
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A) Correct diver, they polished the copper plate to use as a mirror to view the positive which was composed of gelatine wth light sensative silver suspended in it.

I experimented with this when learning Photography, black and white picture days.

Till Eulenspiegle de La Mancha

 

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