Blood's Despatch Post, Philadelphia, Pa., two different 'Blood's Despatch Post' business/advertising cards (48x80 mm or smaller), each details the number of box stations, number of deliveries to the Post Office (and the exact times of their deliveries), the number of Blood's deliveries during each day and their established rates (1c per letter if pre-paid, 2c if collect), one card is black on white enameled card, the other is black on pale yellow card, very fine and choice, quite nice and very desirable collateral pieces