Medal metric system; 1840 with plastic holder; Bronze medallion system (reference) with inscription. In plastic holder. Issued on the occasion of the introduction on 1 January 1840 of the exclusive use of the decimal units of measurement under the law of 4 July 1837; Netherlands; France; anonymous; c. 1965; penning; houder; d; cm h 14 cm x w 10 cm x d 2 cm