As requested, an overall picture of the
yataghans (caution - the order is reversed from the close up of the cartouches above) and also of an inscription on the newer blade.
Unfortunately, I am no
yataghan expert, having only collected a few with good examples of the twist-core work, so we will have to rely on other members to assist with the age and origin of your example.
Your winged spearhead is most attractive and it is nice to see the pattern-welding brought back to its former glory. Presented in polish, the nature of the bands of twist core is very reminiscent of what we are seeing on the
yataghans.
I trust that you are familiar with
Stefan Mäder's work in applying the Japanese style polish to reveal features in medieval steel.