Engraved on this ellipsoid-shaped stamp seal is a left human hand motif with thumb and forefinger joined, terminating in a cuff-like base within a pair of ribbons. At 3 o'clock is a crescent moon and at 9 o'clock is a six-pointed star (in impression). Around the seal, from 3 to 9 o'clock counterclockwise (in impression), is a Pahlavi inscription. An open hand, with the thumb and forefinger either touching each other or holding a tulip, is seen as an auspicious gesture expressing greeting or invocation.

Inscription: 'št't / aštād
Translation: Aštād (Goddess Rectitude; cal. 27th day)

Translation provided by Touraj Daryaee and Kiarash Gholami

References:

Brunner, Christopher J. 1978. Sasanian Stamp Seals in the Metropolitan Museum of Art. New York: The Metropolitan Museum of Art.