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Although the inscription on the blade attributes it to Fathali Shah, legend and fact has it as Nader Shah's sword or his All Conquering Sword.
The sword is not visible in any of the portraits of Fathali Shah. There is, however, a mural in the Marble Room of the Golestan Palace which shows Mohammad Shah Qajar, the successor to Fathali Shah, wearing the sword while on horseback.
Both sides of Nadir Shah's sword handle and hilt are covered in diamonds.
The reverse side of the sword and scabbard shows a picture of the Shah on the hilt along with a few lines of verse, and the pictures of two of his sons.
References
Nader Shah's Sword Wikipedia(Text) CC BY-SA