In its issue of Sept. 7, 1964, Linn's pictured for the first time the four United States 5¢ Christmas stamps depicting holly, mistletoe, a poinsettia and a pine cone.
In his editorial, Linn's founder George W. Linn explained what a first-day cover is for the benefit of new collectors.
"Necessary for a First Day Cover is the new stamp on an envelope bearing the cancellation applied by the Post Office Department showing the date on which the stamp was first put in use," wrote Linn.
Rumark Co. of New York City advertised mint singles of United States Scott 276, the $1 black Oliver Hazard Perry stamp of 1895, for $51.
Today a mint example catalogs $1,800.