Set of 4 Belgian police caps. From the Jean-Marie Krzywanski collection. Privately owned models, without aerator eyelet, two with black piping, one with red floche, number 6 and crown. Two others with red piping. Age and patina. Set of four Belgian side caps. From the Jean-Marie Krzywanski collection. Private purchase models without ventilation eyelets. Two have black piping including one with red pompom, number 6 and crown. Two others with red piping. Wear from use and patina.