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About PSAG
The following stamp images and their associated relative centering grade are to show, in visual terms, what is meant by each grade. Faults and their affect on the overall GRADE are NOT factored into the examples below.

Click on each series below to expand images and for examples of Grades 70-98.

1847-1856,
Imperforate Issues,
US#1-17
United States
Canadian
Canadian Provinces
Canal Zone
Hawaii

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Article Archive
1857-1861,
Perf. 15 Issues,
US# 18-39  
1861-1875,
Perf.12 Issues, US#63-111
1869-1880
Perf.12 Pictorial Issues, US#112-133a
1870-1888,
Perf.12 Issues, US#134-218
1893
Columbian Issue
US#230-245

1898 Trans-Mississippi Expo Issues -
US# 285-293
1901 Pan American Expo Issues -
US# 294-299
1902-1903
Regular Issues -
US# 300-313
1902-1903
Regular Issues -
US# 331-546