A neat item for the Lincoln collectors--campaign ferrotype

I dont know much about these other than what I read on the internet. I though it was kind of cool though and wanted to share.

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Very good brother, is it yours?
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Silver is the mortar that binds the bricks of loyalty.
<< <i>Very cool. Waht can you tell us about it? Is that an actual photo of Lincoln? How rare are they? >>
I guess these are fairly rare and fragile as this one shows. there are many different types although I wasnt able to find this variety in the Heritage archives.
I am not sure what exactly a ferrotype is but I do believe it is a picture of Lincoln, sans beard, and his running mate Hannibal Hamlin.
Curly, I can bring it to the party next month.
Knowledge is the enemy of fear