10 Mark - Köln Franz Stollenwerk

Franz Stollenwerk was a Cologne-based manufacturer who issued emergency porcelain coinage — Notgeld — during the acute metal and currency shortages that plagued Germany in the early 1920s. Meissner and the state porcelain works had no monopoly on the medium; private firms across the Rhineland commissioned their own pieces, and Stollenwerk's brown-glazed issue is among the more obscure of these private commissions, documented consistently across three successive Menzel reference editions without significant reclassification.