some more on the Black Sea Yataghan / Laz Bichaq
https://www.youtube.com/watch?v=8DI6HH9iVxI
https://www.youtube.com/watch?v=KeLiqM_jZPc&t=10s
concerning the latter:
The caption below the clip is:
OSMANLI DÖNEMİNE AİT KESİNLİKLE GERÇEK ORJİNAL BİR KILIÇ 1800 LÜ YILLARDA ÜRETİLEN BİR SUİKAST SİLAHIDIR TARİHİ ESERDİR NADİR BULUNAN BİR KILIÇTIR DOĞU KARADENİZ BÖLGESİNDE KULLANILMIŞTIR.
Translation: A REAL ORIGINAL SWORD OF THE OTTOMAN PERIOD IS AN ASSASSINATION WEAPON PRODUCED IN THE YEARS 1800 THE HISTORICAL MONUMENT IS A RARE SWORD USED IN THE EASTERN BLACK SEA REGION.
source : Mr. Gene Wilkinson
and on its people(s):
https://www.youtube.com/watch?v=qUT-QYYkXMQ&t=35s