stamp: 2011 20¢ George Washington
stamp: 2005 3¢ Silver Coffeepot American Design

stamp: 5¢ Toleware American Design 2008
stamp: 49¢ Quilled Paper Heart
Love Series 2016
https://www.mysticstamp.com/Products/United-States/5036/USA/

stamp: Republica de Honduras post mark 1992

stamp: 1966 “Plant for a More Beautiful America”
https://www.si.edu/object/npm_1980.2493.5619

stamp: 70c Eastern Tailed-Blue Butterfly 2016 non-machinable surcharge

stamp: 37¢ Martin Johnson Heade
American Treasures 2004
stamp: 20¢ Cog Railway Transportation Series 1995

stamp: 44c Love: Pansies in a Basket 2010 The floral design is a detail from a watercolor created by Dorothy Maienschein
stamp: USA $1.10 Global Forever First-Class Mail International stamp 2013

stamp: Art Canadian 88c printed 1995 Floraison / Blossoming, c. 1950, Alfred Pellan

stamp: 20c Virginia Apgar stamp (Oct 24, 1994)
stamp: 50c Jacqueline Cochran stamp Mar 9, 1993

stamp: Helvetia J.B. Levy 1995

stamp: 4¢ Chippendale Chair American Design Series 2007

stamp post mark 1968: France Le Corbusier Chapelle Notre Dame du Haut, the small chapel in Ronchamp, Haute Saone Republique Francaise 1965

stamp: 1986
Le chapeau violet
Peinture de Cuno Amiet (1868-1961), Musée d'art à Soleure
Fr. -.50 + -.20
http://www.propatria.ch/index.php?option=com_sobipro&pid=189&sid=1259:item-1259&Itemid=326&lang=fr

stamp: "April 22, 2014, the U.S. Postal Service celebrates Earth Day by unveiling a new Forever international rate stamp inspired by a simulation of sea surface temperatures from a NOAA model of the Earth’s climate. The round stamp depicts the globe with North America in the center, surrounded by vivid bands of blue, green and red, signifying the varying temperatures of sea surface waters." http://research.noaa.gov/News/NewsArchive/LatestNews/TabId/684/ArtMID/1768/ArticleID/10540/US-Postal-Service-unveils-new-Earth-Day-stamp-celebrating-NOAA-Climate-Science.aspx

stamp: $1.20 Moon Global USA Forever 2016 international rate stamp

cat stamp: Helvetia 50 C. Piatti & M. Müller 1990