3rd Reich 3. Deutscher Apothekertag Stuttgart 1936

In an excellent condition a very rare 3rd German Pharmacist Congress Stuttgart 1936. Huge badge of +/- 6 cm x 5 cm Frontside: 3. Deutscher Apothekertag Stuttgart 15.-22. Juni 1936. With eagle and swastika in a shield. In the middle the Roman Holy Emperor, Fredericus dei Gracia Rex et Semper Augustus. I think they mean the Holy Roman emperor Friedrich I who was also known as Frederick Barbarosa. On both sides of the chair the initials 'KS', perhaps the designer? Backside: Safety pin. No maker markings.