@Ullubu is correct
Yeah, there is a little mistake here. With the Advent Calendar you get the cards from Dec. 2nd to Dec. 25th, starting at Dec. 1st, evrery card one day earlier. So you get the regular X-mas card from Dec. 25th at the 24th and the SEC at the 25th, when people get the normal X-mas card.
And the card from 25th is also missing in the Coming Soon, so this card could be more expensive too.
You still have to buy the December 1st card on your Own.
The Card for December 1st is NOT included in the Advent Calendar.
(also the cards for the 26th, 27th, 28th, 29th, 30th,and 31st are NOT part of the Calendar ) The Calendar starts on December 1st, giving you access to the December 2nd card 1 day early.
So the 24 cards you get are December 2nd through December 25th, which you get on the 24th.
the 25th Window is the SEC card for Free.
The Advent Calendar is 24 cards, 1 Day in Advance
starting with Window 1 that you Open on December 1st, to give you the December 2nd card one day in advance.
Window = Card
1 = Card for December 2
2 = Card for December 3
3 = Card for December 4
4 = Card for December 5
5 = Card for December 6
6 = Card for December 7
7 = Card for December 8
8 = Card for December 9
9 = Card for December 10
10 = Card for December 11
Window = Card
11 = Card for December 12
12 = Card for December 13
13 = Card for December 14
14 = Card for December 15
15 = Card for December 16
16 = Card for December 17
17 = Card for December 18
18 = Card for December 19
19 = Card for December 20
20 = Card for December 21
Window = Card
21 = Card for December 22
22 = Card for December 23
23 = Card for December 24
24 = Card for December 25
Then the Window 25 = SEC Card