Vintage Brutalist Silver-Tone Necklace with Geometric Pendant

This item is a vintage costume jewelry necklace and pendant set, characterized by a distinct Brutalist aesthetic popular during the late 1960s and 1970s. The pendant is a large, square-shaped piece or 'medallion' with a heavily textured, cast metal surface featuring an abstract openwork pattern. The reverse side, visible in the image, shows a matte silver-colored finish with a centered oval cartouche which likely houses a maker's mark or brand signature, though the specific text is obscured by the photo's focus. The pendant is suspended from a substantial, chunky chain composed of decorative, textured links that mimic the organic, rough-hewn look of 'melted' metal. Overall construction suggests a base metal alloy with a plated silver-tone finish. Regarding condition, the piece shows visible signs of age and wear; there is a noticeable patina and darkening in the recessed areas (oxidation), and the plating appears slightly worn on the high points of the texture. The craftsmanship is typical of high-quality mid-century boutique costume jewelry, focusing on bold geometric forms and tactile, irregular surfaces meant to resemble artisan-forged metalwork.