This is self-addressed cover, with both YOG pictorial and slogan postmarks. The cover was sent on 14 Aug (Sat), the first day of issue of YOG stamps. However, there was no mail collection and delivery on Saturday. The mail was only collected on 16 Aug (Mon) and therefore, cancelled with slogan postmark on 16 Aug.
I'm glad that the picture on the slogan postmark matched with that on the stamp. FYI, there are 6 different designs of YOG slogan postmarks from 4 cancellation machines. You may refer to my previous post on YOG slogan postmarks here. These slogan postmarks will be used until 30 Sept.