"Berlin POST-EXP. 23. 25 / 11 71" - single circle postmark with 2.5 mm high characters, KBHW 489, on liable to payment of postage official matter letter with NDP official stamp 1 Gr. to Calau. The postmark was from 6. 11. 1871 till 04. 12. 1876 in use and is on with NDP stamps stamped documents rare, there those only till to the 31. 12. 1871 possible are. KBHW valuation 750 points