Blood's Penny Post 15L14 on cover

Offered is an 1860 cover mailed within Philadelphia bearing a Bloods Penny Post local stamp (Scott 15L14), tied by red circular handstamp. Addressed to G. W. Valentine at 709 Walnut Street, with docketing at left and manuscript notation Paid Apr 21/60. A nice example of intra-city local post service from one of the most prominent private carriers.