Development and characteristic of Ottoman Turk swords

[Radu Transylvanicus]

What do you think about the concept that T handle yathagan belongs to very late 18th century, early 19th century?
Thank you, Rivkin.
P.S. "The Astvatsaturjan ( hard name...) book is maybe the missing link in my library... I have a set published by authorities of Topkapi and Askeri museums coming soon, maybe they will bring more light"