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On 13 November 1995, Norges Bank printing works invited all the company’s families to a big Family Day and all the participants got this note as a gift, but it was soon withdrawn and destroyed because it was too similar to a real note. Everybody was asked to return them, but of course, some didn’t. Many notes were destroyed, and only a few survived. This is one of them. The watermark is NBS (same as NBS on the top right corner on the back) and it has a lot of other security details. Examine the pictures.
Courtesy of Håkon Hagelund.