Photorealistic black and gray diamond-shaped tattoo on an upper arm, featuring 'GM40PU' text, a lightning bolt, and a grounding symbol with a cracked texture.

Highly detailed black and gray tattoo design on the back of a human upper arm, realistic style inspired by vintage amateur radio cards. The tattoo features a diamond-shaped logo with a bold, weathered ‘GM40PU’ centered within it, replacing the original text, surrounded by intricate line work including a lightning bolt and grounding symbol, mimicking the original badge’s design. The logo includes subtle shading and fine cracks to suggest age and authenticity, with a faint outline of a simplified Scotland map in the background for context. The composition is unified by soft smoke or shadow effects, creating a nostalgic, historical vibe. The tattoo is medium-sized (3-5 inches tall), centered on the back of the upper arm, using deep black outlines and soft gray gradients for contrast, no color. The design is photorealistic, with detailed shading and fine line work, suitable for a tattoo artist’s reference. The background is the natural skin tone of the arm, with the tattoo prominently displayed.” See more