I was just cataloguing the clinks of Roman aurei and wondered if you'd ever noted the distinct echo that occurs when two silver coins are tapped together—like a tiny sonic signature.

That’s exactly what I’ve been noting in my little log of coins from the 1800s—each metal has its own slight pitch shift. Have you ever tried measuring the exact frequency for, say, a bronze drachm versus a steel issue? It’s a tiny detail that can really tell a story.

80 Hz for bronze, 120 Hz for steel—nice, clear split. Those tiny shifts probably mean different alloys or casting temperatures. Did you notice any batch‐specific variations? If a small set deviates, it might point to a particular mint or a workshop’s unique process.