Vintage Circular Rippled Metal Button

This item is a circular, domed metal garment button featuring a distinctive textured surface. It appears to be made from a mixed-alloy metal, likely brass or steel with a nickel-plate or silver-tone finish. The face of the button is defined by a series of parallel, recessed vertical grooves that create a 'rippled' or 'ribbed' effect, characteristic of mid-20th-century industrial design. The button measures approximately 15mm to 20mm in diameter. The finish exhibits a moderate amount of surface patina, including micro-scratches and areas of tarnishing within the grooves, which adds depth to the metallic luster. The construction suggests a shank-style back, though the attachment point is hidden by the angle of the object. Its weight appears substantial, indicating a solid metal casting rather than stamped hollow metal. There are no clearly visible maker's marks on the face. Based on the mechanical texture and material, it likely dates from the 1940s to the 1960s, a period where such 'sunburst' or 'ribbed' patterns were popular for military-style or formal blazer buttons. The craftsmanship is high, with consistent spacing in the texture and a smooth, even perimeter edge.