Translucent stone (chalcedony?)
Neo-Babylonian period (625-539 B.C.E.)
This seal would have been used as a personal stamp for impressing clay tablets, like a written signature.
The image shows a man in front of an altar or podium. On the podium are objects, one of which is distinguishable as a spade, which is an attribute of the god Nabu. Nabu is a Mesopotamian scribe god: a patron of writing. He is also a god of wisdom. The owner of the seal probably identified Nabu as a personal divine patron. The star in the sky is of uncertain meaning.
FLP stamp seal