Well,
I managed to free up the toggle and almost completely dismantle the pistol.
The firing pin is completely stuck to the front breach block and it appears to be completely fractured. The rest of the pistol was in an amazing condition. All small parts, with the exception of the sear spring, were all there. Even the little trigger spring was still present. I managed to remove the remains of the stuck cartridge case but there was too much deterioration, so no positive ID on the maker.
The primer looks a bit strange to me and it doesn't appear to have been fired. Makes you wonder where the bullet went... Note that the primer center sticks out.
The receiver was somewhat warped, making me believe that this pistol was subjected to a burst of heat before it went underground. The heat area seems to have been greatest on the lefthand rear side.
These are some close-ups of the case. Sorry for the fuzziness, but my camera lacks a decent macrolense.
