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Stamps (Philately)/1975 Mint Set, Classic American Aircraft, and Celebrate the Century


Hi Mark,

I was going through some old things and came across a storage of old stamps. I was wondering how much a 1975 Mint Set Item No. 932 was worth. I was also wondering the same for a Classic American Aircraft Matted Pane (Item No. 8973E), as well as the Celebrate the Century series for the 1910s (Item No. 5538), 1920s (Item No. 5541), 1930s (Item No. 5542), 1940s (Item No. 5543), 1950s (Item No. 5545), 1960s (Item No. 5546), 1970s (Item No. 5547), and 1990s (Item No. 554900). Really appreciate all the help.



Due to a glut in the marketplace, mint stamps from the 1970's often change hands for under face value.  The 1998-2000 Celebrate the Century issues are a little better, with fault-free sheets selling for about double face value.  Same for the Aircraft sheet.

-Mark Leon

I deal in United States Stamps
American Art Glass
and Halloween Costumes!

Stamps (Philately)

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Mark Leon


I am a collector of United States postage stamps, and also a stamp dealer. I`m a member of the American Philatelic Society (APS). My principle area of interest and expertise is in United States Stamps.


I've been selling stamps on the internet since early 1996. I maintain a stamp web page that concentrates on mint US stamps issued generally between 1890 and 2009. I'm an active seller on since 1996, under the user id "mleon". You can find my web page at

I have a Bachelor of Science degree in computer science from the University of Nevada at Las Vegas, 1984.

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