The magnetic quality noted here almost certainly indicates a planchet composition anomaly — possibly a struck or test piece on a ferrous or partially ferrous flan, which occasionally surfaced during transitional minting periods at Paris when blanks from multiple sources entered the production chain. Standard Napoleon emperor issues of this module were struck in non-magnetic alloys, making any magnetic response worth flagging to a specialist before attribution is finalized.
The magnetic quality noted here almost certainly indicates a planchet composition anomaly — possibly a struck or test piece on a ferrous or partially ferrous flan, which occasionally surfaced during transitional minting periods at Paris when blanks from multiple sources entered the production chain. Standard Napoleon emperor issues of this module were struck in non-magnetic alloys, making any magnetic response worth flagging to a specialist before attribution is finalized.