3 Groschen dark orange, above strong cut into otherwise having full margins copy as a single franking on cover from "Goettingen 2 / 12" to Heidelberg with on the back on route passing cancellation FRANKFURT 2. DEC 1861 and arrival postmark from Heidelberg, addressed to Dr. Erlenmeyer - the chemist and Inventor was, he originated the "Erlenmeyer rule" and the "conical flask