Württemberg, 1850 – Rosenfeld to Stuttgart – Stampless folded letter from the same year as the first Württemberg stamps, bearing double-circle datestamp in blue (“ROSENFELD 20 SEP 1850”) and manuscript annotations “gravblaue hitt,” “Herren,” “Havare, Spring, Amal”, routed to Stuttgart, marked “BF” on front. Red manuscript “4” on reverse indicates the 4 Kreuzer domestic rate for the approximately 20-mile distance