Question: what are rare us stamps?
Answer: The Inverted Jenny. (Courtesy of Siegel Auction Gallery) ... 
1847 Issue Block of 16 of Ben Franklin. ... 
Almanac Stamp of 1765 or 1766. ... 
'Blue Boy' Alexandria Postmaster's Provisional. ... 
1869 Pictorials—Inverted Center Errors. ... 
Two-Cent Blue Hawaiian Missionary. ... 
1860 Stolen Pony Cover. ... 
Pan American Inverts.