This lovely pale blue tile is 6 inches by 6 inches. When I bought it, the tile was already in this holder, and I have not taken it out. There is a picture of the Steen Castle and underneath it says ANTWERPEN STEEN NATIONAAL SCHEEPVART MUSEUM.
Some time back I had written the museum and in their reply was told = I think that this is a souvenir of our museum. Until a few years ago tourists could buy this in our museum that is housed in the Steen, an old castle. = This is no longer available so might be a collectible souvenir.
On the back of the tile it is marked in 4 different squares. Top right has MADE IN BELGIUM S. Lower right has ROYAL SPHINX MAASTRICHT. Lower left has Made in Belgium and some more marks covered by the holder. The upper left has and H in a double circle and HEMIKSEM.