"NOTICE: this list is no longer updated, as this type of stamp is no longer considered to be unusual."
The "flip-flop" method, developed by Cartor Security Printing has the unique property of displaying two images from two different viewing angles. In other words, when the viewing angle changes left to right (horizontally) or upside and down (vertically), different images emerge. One image will be hidden and another image will display when the view angle is changed. See also: Metallic multi image
16-12-2002 - Russia Quarta serie definitivi 09-2003 - Russia Quarta serie definitivi - come i precedenti del 2002, ma con dentellatura diversa I tipo II tipo 05-12-2003 - Russia Quarta serie definitivi 30-01-2004 - Hong Kong Hong Kong Stamp Expo: a seconda dell'angolazione del foglietto č possibile vedere due differenti auguri propiziatori per il nuovo anno 04-2004 - Russia Quarta serie definitivi - come i precedenti del 2002, ma con dentellatura diversa I tipo III tipo
"NOTICE: this list is no longer updated, as this type of stamp is no longer considered to be unusual."