Kudos, Roger! And it's actually the one from your (daughter's) link here: http://rogerjnorton.com/LincolnDiscussio...e#pid36572
My idea was that a cake would be something suitable for an Advent calendar...I'm sorry if it was the lacking enlargement that prevented you from guessing - I updated my photo editing program, maybe there's an error so that the attachments didn't work out as usual. I'll try to find out.
Now here's your prize, Roger: