A First for me.

Since we're into December, I gather it's NOW safe to use "the C word" and say "It'll soon be Christmas".
When we were kids I have no recollection of Advent calendars.  Alice and I were sprogless, so we never had one for the house.  This year I started supplementing my cooking with the odd order from Wiltshire Farm Foods (How's that for Product Placement)  They are thorough to the extent they actually sent me an email telling me my latest order had been delivered; like I hadn't noticed? 
With it came a 2021 Calendar and the above Advent Calendar.

In answer to the, at least two, questions - I could see the back, identical wee squares of chocolate.

;¬)