The Fourteen-cent Prexie
Parcel post use
The parcel post postage for Zone 4 was ten cents for the first pound and three-and-a-half cents for each additional pound between October 1, 1932 and March 26, 1944.
This label from a parcel shows correct postage for a package weighing between one and two pounds.
Parcel post postage for Zone 4 was fourteen cents for the first pound between January 1, 1949 and October 1, 1951.
This package was sent between Chicago and Cornwall, Pennsylvania in 1950, a distance just inside the Zone 4 limit.
The parcel post postage for Zone 3 was nine cents for the first pound and two cents for each additional pound between October 1, 1932 and January 1, 1949. During that period, for items mailed after March 26, 1944, there was a 3% surcharge, with a one-cent minimum.
This is not, of couse, technically a solo use of the fourteen-cent Prexie, but it is a use where the entire postage is paid by it. It is a tag used to mail freshly-caught trout between Gunnison, Colorado and Denver. The rate is correct for two to three pounds plus a one-cent surcharge.