Here is a complete set of 1941 "Tag der deutschen Polizei" (German Police Day) pins. The pins are on their original, somewhat worse for wear, cardboard backing displaying them for sale/donation individually. The form they took for this year was a set of traffic signs. Appropriate for the Polizei as this set is also educational for youth traffic safety. Kids could collect the whole set and adults could wear them on their lapels showing that they made a charitable donation through their "friend and helper", the police. These donation pins are often mistaken for WHW (Winter Help) donation pins but the Police Day pin donation money went to vetted police charities whereas WHW money went to other NSDAP Party charities.