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This stamp and its request for identity appear quite often on this forum.
It is the stamp of Hundevad & Co.
Danish control
http://www.skovby.dk/showpage.php?lang=EN&pageid=7031640 its a quality control stamp
Thanks AlexanderNørup but we are looking at the makers mark at the top of the posters image.
Moon
is right.
Hundevad had 2 marks they used.
One with a HU unside each other and the other like you show above.
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