Iron cross 1st class by C.F. Zimmermann, Pforzheim. Three piece construction with magnetic, iron core. Maker marked with the PK code "20" on the reverse of the pin. Very good condition, probably never issued piece in its 80+ years original patina. No repairs, no damage. Complete in an original earlier style iron cross box and with the rare Zimmermann marked outher cardboard box, so called "Überkarton". 

Premium and rarely encountered full set!