“Machine Identification Code” on personalized stamps
The history of the discovery of the Machine Identification Code on personalized stamps, in this case we talk about the spanish service which started 1st of January 2007, is interesting and quite funny!
One day, when I received the first day cover of the “TuSello” ArGe No 1, me, as the designer of the stamp, I couldn’t wait to get my magnifying glass to have a detailed view. I was very interested in how the print quality was. A bit disappointed about some blue and yellow dots all over the stamp I thought: “Pretty bad quality!”. But one thing was strange: the yellow dots seemed to have a specific distance between each other, the blue dots didn’t show such a regular pattern.
Next step was to scan the stamp. In lower resolutions than 300 dpi, the yellow dots where almost not visible. So I used 1200 dpi. On the screen I could already see the yellow-dot-pattern. Extracting the yellow color part of the scan it was obvious: There’s a dot-pattern all over the stamp!
I informed my friends Oswald Schier and Antonio Leira about my strange discoveries. We were speculating wether it was a secret code, or may be FNMT in Braille, or .... ???
Searching the web I found an austrian personalized stamp in proper resolution. Extracting the yellow color values it was clear: Austrian personalized stamps also use this strange code....
After a while chatting with Antonio Leira about the “code”-issue, he had a sudden “HEUREKA” effect! He remembered an online article about the discodification of the code, laser printers use to prevent forgeries of paper money.
This website was the solution! The code and how it works was very well explained. It offers also a little online programm to decode the dot patterns on the stamps. Perfect!!
The code contents: Exact date and time of printing the sheet and a Machine Identification Number to recognize the printer.
As this was clear, Oswald Schier said: “This is worth to write an article about! This code gives us the perfect possibility of catalogizing the new field of spanish “TuSellos” and may be personalized stamps in general.” Interesting is, that the Austrian Collectors and Experts until our discovery didn’t know about the existance of a Machine ID Code on their stamps although they have this type of stamps since 2004 already! And think about: Even the stamp services didn’t know it!!
Ulrich Reinartz
|