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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.

Experience in the area

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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    K = Knowledgeability    C = Clarity of Response    P = Politeness
Brian02/10/17101010Thank you kindly sir
steve E01/27/17101010Thanks Mark. I had no idea. They .....
Elizabeth12/09/16101010Thank you for your time.

Recent Answers from Mark Leon

2017-03-01 souvenir pages:

James,    The 1970's saw a stamp collecting boon, because people were looking for any investment that would protect their wealth from high inflation (and as it turned out, stamps were not the solution

2017-02-28 Cleaning out parents home:

Cheryl,    The Gold Star Mothers issue is from 1948, and the Marine Corps issue is from 1966.  The stamps have a catalog (retail) value of 25 cents apiece, but in the wholesale market they change hands

2017-02-25 souvenir pages:

James,    Mint stamps with full, original gum are generally more valuable than the same stamp in postally used (cancelled) condition.  That said, stamps issued post-World War II to the 2000's have not

2017-02-06 Rare perf franklin??:

Brian,    I've never heard of the 30 cent Franklin issue perforated 11-1/2.  I recommend showing the stamp around at the next stamp club meeting in your area.  See if others concur with your measurement

2017-01-26 stamp:

Steve,    The $5 and 50c dated 1953 red documentary revenue stamps you describe are designated Scott numbers R642 and R630 respectively.  In used condition (but otherwise fault-free and eye-appealing)


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