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Stamps (Philately)/scott 610, 611, 613

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Question
Hi!

Two quick questions:
1.  Did what we now identify as the Harding #610 stamp used to be identified as the #611 in the 1950's?

2.  What are some insights into identifying the #613 made out of "rotary sheet waste" and the look-alike #610?  Is there a microscopic difference in the paper under magnification?  Or is it in the measurement in mm?

Sincerely,
John

Answer
John,

1. No.  610 and 611 are both flat plate issues, the difference being that 610 is perforated, and 611 was issued without perforations.

2. The design used to print 610 and 613 are identical, but the printing methods differ.  The rotary press 613 design is a quarter of a millimeter taller than that of 610.  The stamps are also readily distinguished from each other by appearance.  The flat plate 610 is a cleaner, more refined impression than that of 613.  The design size and appearance of Scott 613 is identical to Scott 612, given that both are rotary press issues.

-Mark Leon

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Stamps (Philately)

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Mark Leon

Expertise

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.

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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 ebay.com since 1996, under the user id "mleon". You can find my web page at http://www.forwardedge.com/usmints.html

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

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