One of the keys here is niello - very typical caucasian work; indeed, niello of this type has been made in Trabzon; I doubt its production spread as far as Montenegro.
Concerning pontic greek affiliation - I don't know about Trabzon, but in Abchazia the policy of local ottoman leadership was to kill or seriously main every greek who spoke or wrote in greek (see "The Reports of the Edinburgh "Missionary Society in 1817-1818 with the supplement of the geographical and historical description of missions in Asian Russia"). For reasons I don't exactly understand ottoman policies in western georgia were more anti-greek than probably anywhere else, while the same logic did not apply to other languages. Therefore I would not expect anything from this area to bear any signature or writing in greek.
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