1923, insured letter over 1. 400. 000. 000 Mark (1.4 Billions) from "Plauen 21. 8. 23" together with violet three-line cancel "nachw. In Plauen (Vgtl) / cleared expertized" with manuscript registered Postage rate "16500" (Mark) to Bad Elster, reverse two red varnish seal and arrival postmark