25 Pfennig - Aachen Pattern

Aachen's 1920 emergency coinage program produced an unusually large number of pattern and trial strikes across different materials, as city authorities negotiated between practicality and the realities of postwar metal supplies. Iron was tested but rejected for general circulation — corrosion in the damp Rhineland climate made it a poor choice for a coin expected to pass through thousands of hands daily. The Funck 1.7G designation places this among the documented pattern variants, not a circulation strike that slipped through.