Hi Bradley, Welcome to the forum. Pictures are a must if we are going to be any help to you. First the bad news: the rear toggle pin is not original to the gun, it should be unnumbered and carry an Erfurt firing proof (an eagle). Secondly the good: the numbers you see under the barrel are 8,83, the diameter of the barrel in millimeters, from land to land. From here on we'll need those photos! Regards, Norm
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