The 18 is the year.
There are quite a few non 10 tops that look really good. The label is an art, not a science.
Also, Experience runs typically have very nice tops that are not labelled 10s. For example this one I picked up at 2009 Experience.
Stunning! So you are saying experience runs do not have a 10 stamp?? That would explain this guitar, but I believe my other one was as well and has a 10 stamp. ?????