Create a classic Roblox-ready 3D prop in Default style for Returnbound: a small worn metal gear or keepsake mechanism, target size 0.80 x 0.80 x 0.16 studs, 1,200 to 2,000 polygons preferred and never above 10,000, chunky gear teeth, simple broad wear marks, anonymous scuffed marks where initials might have been but no readable letters, blue and faded gold memory glow points, personal evidence object, clear silhouette, restrained horror, no gore, no text, no named character, not photorealistic.