Part of the WWI war rate taxes included a tax on Parcel Post packages.
This tag has not only the required parcel rate (unchanged for the War period), but has the required added revenue stamp to pay the extra tax. According to the rules, the tax could only be paid with revenue stamps, not postage stamps. This rule applied as well to packages mailed overseas to the war zones.
This example is quite interesting, as it indicates that the parcel contained 16 pounds of peanuts, mailed within the state of Washington. Parcel labels and wrappers from the First World War period are difficult to find, and are often priced highly by dealers, especially if they carry Parcel Post stamps (first used in 1913).
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