1/2 Groschen - John I

John I ruled Lorraine from 1346 until his death in 1390, navigating the duchy through the turbulent aftermath of the Black Death and persistent pressure from competing regional powers. This half-groschen issue falls within the period when Lorraine was actively adapting the French gros tournois system to local monetary needs — a practical response to the dominance of French coinage in northeastern trade circuits rather than any formal monetary agreement.

Flon's attribution places this type among a small cluster of issues from John's later reign, distinguished from earlier emissions by subtle metrology shifts that reflect the broader European silver shortage of the 1370s–80s.