In interesting notes with further information, an auction lists one of these as being of .600 cal. (25 bore) (Thank you Norman!) which seems to have been a popular caliber from Europe with some of the large 'horse pistols' earlier in France and England.
In some old notes regarding shashkas and imported blades I found the name Tanner listed along with blades sources Solingen and Styria, suggesting this form certainly must have been an active purveyor of arms for the Caucusus.
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