For some reasons I can't find it in my regular catalogs: the 50Aurar anniversary of Alþingi has a different design in Scott catalog - the perfs are slightly similar to the bottom of your stamp:
Many Iceland stamps had perforation issues but those were all from H.H. Thiele in Copenhagen, whilst this Millenium issue was a De La Rue printing. It looks like a doubled pin, but I'm trying to get my head around the geometry of it. A nice oddity, and on one of my favourite issues too.
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