This is a Mid Century Modern vintage art glass vase, characterised by its tall, slender neck and a wider, square-shaped base. The glass features a mottled pattern in shades of orange and black, indicative of art glass craftsmanship.

This piece is potentially Empoli - however please note it hasn't been positively identified as such.  Empoli glass, originating from the Empoli region of Tuscany, Italy, boasts a history spanning centuries, with significant production starting in the 15th century. It's characterized by its simple, functional designs, often featuring a distinctive green color derived from the local sand's iron content. While initially focused on practical items like bottles and carboys, Empoli glass evolved to include decorative pieces, particularly during the mid-20th century.