Stamps (Philately)/Expert Profile

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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
Elizabeth12/09/16101010Thank you for your time.
BRIAN11/03/16101010Everyone says to buy what you like .....
Richard10/23/16101010Thank you, Mark. I didn't find this .....
Prashant S Akerkar10/10/16101010Dear Mark Thanks. Prashant

Recent Answers from Mark Leon

2016-12-06 Stamps and a medalic postal cover:

Elizabeth,    I don't have any experience with medallions, but I can tell you that the stamps pictured are quite common in postally used condition.  Such examples more often sell by weight rather than

2016-11-08 rare versus hype:

Brian,    I answer yes, that the seller might be honest, but value is far more dependent on popularity than rarity.  Something can be factually rare, but have little value to collectors.  Say for example


Brian,    You are correct to refer to them as postal stationary, or to be specific, postal stationary entires (because some collectors only collect the corners with the imprinted stamp).  Modern postal

2016-10-20 RF27:

Richard,    RF27, the blue playing card "1 pack" revenue issue from 1940, is valued at $3.00 for each fault-free, eye-appealing mint example.    -Mark Leon    I deal in United States Stamps  http://www

2016-10-16 Washington & Blue Oval Lincoln Profile:

Courtney Johnston,    Both stamps are common in used condition, and the unfortunate trimming of the surrounding paper so close to the design of the printed stamp, actually reduces whatever collectible


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