A major Siebold FDC customer was William Seaver, a patent attorney whose office was across the street from the U.S. Patent Office. Seaver would form an outstanding collection of FDCs during the 1920s and early 1930s. Yes, he had the dollar valued regular issue FDCs of 1923. Even though the collection was started with Siebold serviced covers, Seaver would also service many FDCs for himself. Seaver’s collection became available to collectors through various dealers in 2010 and 2011.