GRILLED ISSUES
In 1867, the U.S. became the first country to issue grilled stamps to thwart their re-use. In theory, the embossed ""waffle iron"" impression aided the stamps in absorbing cancellation ink, but in practice made them more difficult to separate along perforations and more likely to tear. In 1871, permanent canceling inks were developed and grills were discontinued.
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1847-1861 #1-39
1861-1869 #63-122
1870-1879 #134-191
1880-1889 #205-218
1890-1899 #219-293
1900-1909 #294-373
1910-1919 #374-546
1920-1929 #547-681
1930-1934 #682-751
1935-1939 #752-858
1940-1944 #859-926
1945-1949 #927-986
1950-1954 #987-1059A
1955-1959 #1064-1138
1960-1964 #1139-1260
1965-1969 #1261-1386
1970-1974 #1387-1552
1975-1979 #1553-1802
Airmails 1918-1939 # C1-C24
Airmails 1941-1993 #C25-C132
Airmails 1999-2008 #C133-C145
Commemorative Sheets
Confederate States
Definitives
Duck Stamps
Errors
Express & Priority
First Day Covers
Parcel Post & Special Delivery
Postage Due
Se-tenant Sheets
US Year Sets
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