The vast majority of authentic Lalique items feature a signature mark, though the specific type, style, and placement of the signature vary widely depending on the production year and era. Early vintage pieces created by René Lalique often feature etched script signatures, mold-pressed initials, or engraved monikers, while later crystal works incorporate acid-stamped signatures like "Cristal Lalique France." However, certain minor components of larger sculptures or antique experimental objects may occasionally lack visible signatures, requiring expert appraisal.