1982 20¢ American Architecture Mint Block

United States #2019-22 20¢ American Architecture - 4 Varieties, Attached Plate Block Varieties include: #2019 - Fallingwater Mill Run #2020 - Illinois Institution of Technology #2021 - Gropius...

United States #1928-31M 18¢ American Architecture Mint Se-tenant Block of 4

United States #1779-82 15¢ American Architecture Mint Se-tenant Block of 4

United States #2006-09 20¢ World's Fair Mint Se-tenant Block of 4

United States #1974 20¢ Michigan Mint Single

United States #1970 20¢ Louisiana Mint Single

United States #1976 20¢ Mississippi Mint Single

United States #1996 20¢ Utah Mint Single

United States #1999 20¢ Washington Mint Single