This is a Tabaristan Silver Hemi Drachm (24mm, 1.9g). Coins like this were used for trade and in commerce along the Silk Road that linked China and southeast Asia with the Middle East and Europe. The obverse shows the right facing bust wearing a winged crown. The reverse shows attendants flanking a fire altar. This coin is graded Almost Uncirculated by NGC. The hoards that these coins were discovered and labeled on the holder may vary.