Not printed on both sides. Note that the image on the back is reversed. It is an offset caused by laying the sheet on top of another where the ink had not fully dried causing a transfer to the back of the sheet.
Hi tokgae, and welcome to the forum. I believe what you have there is an example of "offset" from the pane of stamps underneath it at the printers. This happens quite a lot, and I do not think there is any value attached to it!
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Posted 02/11/2016 09:33 am
