Hello and Thank's a lot Werecow for your comments,
Really nice quaddara ! sadly not yours ( neither mine

)
what is uncommon in this kindjal are as you said these large knobs/rivets,
2cm/ 0,8 inches high
and a particularly thin but long blade : 3cm/1,2 inches at larger part of the blade
and scabbard with this huge final ball, 2,3cm/0,9 inches diameter
complex of the owner ?
more seriously, a caucasian habit ? from a close geographic area or fashioned sytyle in a period ( glad if we can defin-fix it when !)
Kind regards