1/9 tintype of a boy, possibly in uniform. It looks like his hand it resting on some object off to the right that is hidden by the mat. Tintype is behind mat and cover glass in half of a case. Under magnification that white stuff looks like it could be brushed off of the image if you open it up...
It doesn't appear to be corrosion or anything permanent. This item is in the category "Collectibles\Photographic Images\Photographs". The seller is "jack_mord" and is located in this country: US.
This item can be shipped worldwide.