1918 Inverted Jenny Stamp
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Today there are 1782 U.S. Stamp sets registered.

United States Stamps

· 19th Century Regular Issues

· 19th Century Commemoratives

· 20th Century Regular Issues

· 20th Century Commemoratives

· Commemorative Year Sets

· Shanghai Overprint Issues

· Airmails

· Special Delivery Issues

· Parcel Post Issues

· Postage Due Stamps

· Official Stamps

· Revenue Stamps

· Federal Duck Stamps

· Newspaper Stamps

· U.S. Design Number Sets