Itaca, the dagger with the hilt encased on brass(second one from your pictures going from the top down) is Bulgarian, there is no doubt about that. It was probably made in Gabrovo, the main knife making center from the early 20th century, though unless there are markings it would be impossible to tell for certain. I am not sure about the first dagger you show, as it looks like a custom creation.
Teodor
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