It was not others saying, it was me. Those half grades did not exist before mid-2012.
The submission numbers are generated online or they are on the pre-printed submission forms. They might be used at a later date. SGC assigns old unused numbers to submissions for different reasons. That is why dating when cards were graded by using the cert numbers can be useful but not 100% accurate. It's a general rule, an indication, or estimate.
You should probably just forget any suggestions I made and just send whatever you were planning on sending. The only reason I responded was because you were getting inaccurate answers to your questions. Sorry I confused you.