This is vintage signet ring that dates from 1930s. It is a very nice quality example and it is engraved with a bird (perhaps an eagle?) with elevated and inverted wings and which stands on a plinth.
The ring has very softly rounded edges and would be really comfortable to wear on a day-to-day basis. It would fit a finger size M/12 (UK/Australia); 61/4 (US/Canada). A little resizing possible, which we would carry out in our own jewellery workshops.