The 1861 stamps had in common the letters "U S" in their design. To make them differentiable from the older stamps at a glance, all were required to have their values expressed in Arabic numerals (in the previous series, Arabic numerals had appeared only on the 30¢ stamp). The original issue included all the denominations offered in the previous series: 1¢, 3¢, 5¢, 10¢, 12¢, 24¢, 30¢ and 90¢ stamps. Numerals apart, several of these are superficially similar to their earlier counterparts—particularly because Franklin, Washington and Jefferson still appear on the same denominations as previously. Differences in the design of the frames are more readily apparent.