Brutalist-style cast metal brooch

This item appears to be an organic, abstract-form brooch or pin, stylistically consistent with the Brutalist jewelry movement of the mid-20th century. The piece measures approximately 2.5 inches in diameter as seen against the included scale. It features a rugged, irregular texture with numerous protrusions and void spaces throughout the design, suggesting a lost-wax casting or similar molten metal technique. The surface exhibits a metallic gray finish with dark oxidation or patina in the recessed areas, which highlights the high-relief elements. Per user description, the material is non-magnetic but not silver, which may suggest a pewter finish or a base metal alloy such as a tin-lead variety often used in studio jewelry of this period. There are no visible maker's marks or signatures on the front of the piece, and without a view of the reverse, the attachment hardware (pin stem and clasp) cannot be evaluated. The owner identifies this as an unsigned 'MCM' (Mid-Century Modern) piece, which is consistent with the visual evidence but remains unverified without physical testing or provenance documentation. Condition appears good with intentional textural variation and age-appropriate surface wear.

Based on the image provided, I have examined this abstract-form brooch, which displays characteristics of the Brutalist movement popular in the mid-20th century. What I can see is a complex, high-relief surface suggesting a lost-wax casting technique. Per the user submission, the piece is non-magnetic but not silver, and is identified as an unsigned Mid-Century Modern (MCM) item. I cannot verify the specific metal alloy or the integrity of the attachment hardware from this photograph alone; a physical inspection would be required to rule out brittle base metals or past repairs. The value estimate is predicated on the hypothesis that this is a high-quality studio piece from the 1960s-70s. In the current secondary market, unsigned Brutalist jewelry of this scale and texture generally commands a modest but steady following among MCM collectors. The lack of a maker's mark limits the value, as pieces bearing signatures consistent with known studio artists like Jerry Fels or Pal Kepenyes would typically command significantly higher premiums. Should this piece be revealed upon physical testing to be a contemporary mass-produced reproduction rather than a period studio item, the value would likely drop to a decorative range of $10-$20. To confirm its origins and potentially increase its marketability, I would recommend an in-person examination by a jewelry historian to identify potential 'hidden' marks and a metallurgical test to determine the exact alloy. Without provenance or a verifiable signature, the value remains tied to its aesthetic appeal as a 'style-of' decorative object.