Cover initially posted at Painted Post, NY, August 6 (1857 per enclosure) franked with an imperforate 3¢, Scott No. 11A, addressed to Albany, NY. At Albany the address was changed to Schenectady, NY, an additional 3¢, represented by a perforated 3¢, Scott No. 25, was added and the cover was forwarded on August 7th. No markings on the reverse side of the cover. My question to the forum is how common or uncommon is this franking combination?