blue four-horse stagecoach design with "Overland Via Los Angeles U.S. Mail" directive on yellow cover to Rockford, Illinois, franked with imperforate 3c Dull red horizontal pair (11) and perforated 1c Blue and 3c Rose (24, 25), all tied by blue "Petaluma Cal. Apr 25" double circle datestamps, expertly cleaned and pressed, very fine, a colorful and unusual franking, ex-Haas and Piller