The pattern of your coin matches the one here:
which has the following description:
Kumaragupta I, silver drachma, c. 415-455
Weight: 2.08 gm, Diameter: 12 mm.
Head of king right /
Stylized Garuda standing facing, with wings spread,
Brāhmī legend around:
Paramabhāgavata Maharajadhiraja Sri Kumaragupta Mahendraditya
The one in my comparison picture, with your coin on top and an auctioned coin at the bottom, sold for $15 US dollars in a recent auction. My guess is that yours is worth about that amount.