I vote for forgery (maybe meant to be gold plated?).
For silver (billon) coins during the 9th/10thstandard under Mahmud, at 20-21 mm I see the much heavier 20 para coin KM-596 (1.35-1.6 g.). Or, 0.8 g would more closely match a 10 para coin, KM-595, which should be only 17 mm. And both of these have quite a different design (wreath below toughra, not flowers around it, etc.).
But it looks like quite a well made coin.

For silver (billon) coins during the 9th/10thstandard under Mahmud, at 20-21 mm I see the much heavier 20 para coin KM-596 (1.35-1.6 g.). Or, 0.8 g would more closely match a 10 para coin, KM-595, which should be only 17 mm. And both of these have quite a different design (wreath below toughra, not flowers around it, etc.).
But it looks like quite a well made coin.
