Actually I strongly suspect this type of kindjals is characteristic to entire western Georgia - North-East Turkey area. I do not think it is from Azerbaijan, also because niello is not of deep, Dagestani style, but more of a "flat" style, actually I would say quite characteristic for the area. Below are too images - Gurians with kindjals like the one you have, and the map of georgian tribes (as you can see Guria are quite a long way away from the border. One also has to note that in the time entire Adjaria was muslim and the power constantly shifted between Ottomans and Russia (later Georgia).
