I love your entries, dear Priska; great idea too.
Well, I was searching very long, and with help from Karel I found the challenge (almost on the end).
And now my last here.
It is an old coal-scuttle. There in earlier times they scooped it full of coal to place beside the coal stove.
I can still remember that we had at home a long time ago, outside a very large wooden box with a lid, and there were a lot of coal (ovoids).