This is the image sheared from the stamp end of a pyramid shaped stamp seal or amulet. It is carved in brown stone. I would call it sandstone.
It is photographed and published in the book Myths of Ancient Bactria-Margiana on Its Seals and Amulets, by Victor Sarianidi, the excavator of much of the Bactria-Margiana cultural ruins. Dr. Sarianidi, now deceased, visited us and photographed most of our Bactrian collection. Now most of the items we collected while we lived in Afghanistan, where Bactria is located, are published in Victor's works.
This item is found on pages 256,257 of Myths of Ancient...., plate 1408.1 and 1408.2 as
'1408 Seal. Pyramidal stamp. Brown stone. 2.5 x 2.4 cm; h (thickness) 1.4 cm (corrected by owner to record the actual measurement of thickness as 4.3 mm)
This is a valuable addition to your collection of glyptics, whether from the Bactria Margiana Archeological Complex or from other related cultures.
There is no shipping charge.
Ancient Stone Seal from Bactria Image of Horned Goat Two Crescents | craftsofthepast - Antiques on ArtFire