I saw it...
First, despite the eagle, there is no corroboration, either marking or inscription. Also, I have an uneasy feeling about the light area around the eagle. It was advertised as Russian. As you know, Russian oligarchs would pay extra for anything "imperial" ( post-revolutionary nostalgia, I guess). Adding a double-headed eagle to a Turkish shamshir would be a piece of cake and would bring extra money. I guess that's the origin of the double-headed eagle. And... it worked! More than $4k, as far as I remember.
Do not despair, old son!
And, BTW, you better start bragging about Tirri's Laz Bichagi