We buy and sell United States singles, sheets, plate blocks, booklets, panes, and plate number strips. Our focus is to offer a complete inventory of all U.S. issues (including most varieties) from the 1930’s to present. We also offer earlier and rarer U.S. issues, as well as worldwide. The ACS Stamp Company has been serving stamp collectors since 1988. It is owned and operated by American Philatelic Society life member Keith Wagner, whose goal is to provide you with the stamps you want at a reasonable price.