Type/Style: It is a short, wide, heavy-bottomed tumbler. This specific shape is most commonly referred to as an Old Fashioned Glass or Rocks Glass (Lowball Glass).
Material: It is made of clear glass (likely pressed glass, possibly an imitation of cut crystal).
Body Pattern: The main body of the glass features a pattern of vertical cuts or grooves (also known as a ribbed or fluted design). This enhances the grip and beautifully refracts light.
Base Pattern: The lower section and heavy base are characterized by an intricate faceted, diamond-cut, or cross-hatch pattern. This decorative base adds stability and a touch of vintage elegance.
Heavy Base: The thick, substantial base is a characteristic feature of rocks glasses. This provides stability, prevents the drink from warming up quickly, and can withstand muddling of cocktail ingredients (like sugar and bitters for an Old Fashioned).
Rim: The rim appears to be smooth and clear, contrasting with the heavily textured body.
Aesthetic: The combination of the vertical cuts and the patterned base gives the glass an overall Art Deco or traditional cut crystal aesthetic.