teh-tula vs koftgari on kindjals and other weaponary of the caucasus

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I think Tula refers to Niello technique here. Niello is called Tula in many European countries as most Niello work in Europe was produced in Russia (in Moscow and Tula) from 18 to 19 Centuries. Therefore, the question posted is about identifying origin of Caucasian arms based on Niello and Coftgari decorations.