Let's post on the English forum since this is were, I guess I'll find most specialists of Indian coins.
I think my coin is from Indian Northern dinasties (Gadhaiya) and could be https://fr.numista.com/catalogue/pieces38271.html or https://fr.numista.com/catalogue/pieces272540.html. But I hardly see (except the metal) the difference between them.
Obverse:

Reverse:

(The coin looks lighter; I guess the photo is a little bit underexposed).
And here is some data about the coin:
- Metal: looks like silver but could be billon
- Mass: 4.43 g
- Diameter: between 14.3 and 15 mm since the coin is not perfectly round
- Thickness: 4.12 mm
As said, the coin looks like the two specimen I've indicated since I have read somewhere else that the dyes are larger than the planchet, thus it is not uncommun to see only a part of the design (for instance, on the reverse, the right side of the altar is not seen).
Any guess?