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Hipparchia semele
Dunes, coastal area. http://www.natuurenbos.be/teryde
Yop! I think this is it! I have checked in the area with this name and there are sightings. Now that I see the butterfly in internet pictures I can remember better its inner pattern and it really looks like the one. I am happy to have seen this species for the first time. Many thanks, bayucca! ;-)
Looking at the location I think there is not much possibilities (or no) others than Hipparchia semele. Please, verify!