PetrusAscanus is on the right track, an Indian sultanate coin, with a date ending in 88. Jaunpur sultanate stopped making coins before 988. Examining the date closely, it looks like it could be a partial 7 in front of the 88.
Following this line of reasoning, matched with a Delhi sultanate billon tanka of Firuz Shah Tughluq, Hadrat Delhi, minted 784-790 and later. Goron & Goenka D476.
https://en.numista.com/catalogue/pieces130167.html
Weight should be about 9 g. Nice coin.