Thanks for taking a look, I've got this old Derringer that I cannot confirm its manufacturer and was hoping some of you might have seen this around.. About half way down the barrel the engravings become legible, MFG CO PHILADELPHIA. Aside from these two pictures at the end of the barrel the inner wall is hexagonal. I've been told with some uncertainty it could be a Jacob Rubertus .22 Rimfire, as a search came up dry on most search engines I've yet to compare. Any ideas ?
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