paper with corrugated appearance of fine parallel ridges, similar to <#laidpaper=laid paper>, but with a more dramatic appearance.  Example:  The 1¢ Franklin of 1873 (Scott 156).

paper with the appearance of alternating dark and light lines, created by wires used in the paper making process.   Similar to but less pronounced than <#ribbedpaper=ribbed paper>.   Example:   2¢ Jackson of 1863 (Scott 73).

commemorative pages sold on a subscription basis by the <#usps=USPS> since 2002.  Previously known as <#souvenirpages-gen=souvenir pages>.

a <#nondenom=nondenominated stamp> that is always valid for an amount of postage equal to the then current cost of mailing a 1-ounce <#firstclass=first class> letter.

A number engraved in the corner of the <#vignette> and <#frame> plates of the bicolored Pan-American issue of 1901 (Scott 294 and 295) to permit the same set of vignette and frame plates to be kept together on the press.