Ah, a relic from a legendary commander—quite the catch. It’s likely a silver brooch that was once part of the commander’s uniform, used to fasten his greatcoat. The brooch has a tiny engraved compass rose, a symbol of his reputation for never losing his way. It’s survived three wars and a fire in the castle’s great hall, which adds to its mystique. If you can prove it belonged to him, it could fetch a decent sum, but the provenance is key. Look for old service records, and maybe a family heirloom registry that mentions the piece. Good luck, and let me know if you find it; I’ll gladly help authenticate it.