Great work and thank you very much Rivkin.
No, we don't know how it finds itself in Poland, it was purchased in 1962 without any knowledge about it.
Second time, so all in all in two Polish catalogues of arms and armour, I found this sword is called SHAMSHIR

. Is this some misunderstanding or something, or do we really can call this huge, big and clumsy sword with the name od light, slick sabre?