Help in identification and valuation

Hello,
my grandpa left me this coin.
Can you please help me to identify and vauate it?
Thnak you so much
My regards
Francesco

I could be wrong but I think it is not a coin.​

​ I don't know, it's quite similar to this:

https://en.numista.com/catalogue/pieces72553.html

but not exactly similar, if you look at the photos.

Welcome to Numista!
It is a beautiful coin!
You should know that these are manually hammered.
So many variations exist.
The dies of hammered coins are quickly worn, so many new are cut, with small differences.
For the real value you should contact an auction house and a jeweler to test for gold.

Again, very nice coin.

This is a gold dinar of the Fatimid Dynasty, struck by al-Mustansir 427-487 AH / 1036-1094 AD.
It was struck at the Misr mint (Egypt) and is dated 446 (1054 AD). The style is known as the “bull’s eye” type because of the concentric rings and the pellet in the middle on both sides. It is a common coin for this ruler. Sale prices can be checked on the internet.

References:
Sylloge of Islamic Coins in the Ashmolean, v.6, The Egyptian Dynasties. Plate 34 #688, 689.

A Corpus of Fatimid Coins by Nicol. #2129.