1 Mark German Reich with overprint "Sarre" in type I, variety "inverted overprint", used as a single franking on postage exceeding tariff rate register distance letter from "MERZIG - * (SAAR) C 18. 4. 20" to Cologne with reverse arrival postmark from 19. 4. 20, cover with age traces and rest of hinge, the quality of the stamp is perfect, photo expertize brown BPP (2014), Michel 1. 800. for lots