Hi Nic,
It looks like this says from the Viol range. Decoration by Holmegaard painters and dated by them 4-4-1945.
I will check the date, as this may be the date of liberation from Germany.
Having checked this appears to the be the date of the withdrawal from Denmark, of the bulk of German occupying forces, with the official Liberation day following a month later on the 5th of May 1945, when all German forces surrendered.
Regards,
Marcus