1854. 2 Sk. blue. Printed invoice sent “Pr. Cuvert” (sent in a parcel og large letter with other printed matters) from Aarhus 18.3.1861 to Odense. Delivered to Odense Post Office and sent ad LOCAL COVER in Odense 21.3.1861. Destinct numeral 51 and BLUE antiqua 21.3.1861 (used on the second day of usage (earliest known)). THE COVER IS THE ONLY KNOWN RECORDED LETTER DEMONSTRATING THE PRAXIS. Outstanding exhibition item in excellent condition. Ex. Kurt Hansen. Certs. Nielsen and Møller BPP [ 3 ] [ ✉ ]