You should be able to immediately feel the difference between the two. I will double check all of my glow Ascents, but I thought they were all the newer more overstable mold.
I'm going to assume they are all the same as they feel and look identical. Haven't had a chance to throw the newest one which is the only one I have that has the 1 tooled into the back.
Still wondering if there is a consistent method to determine this other than feel alone (ie. the tooling mark). Maybe the 'new' mold is a few years old and all the newer Ascents are the beefy variety and the 1 tooling is just a new machine and/or a duplicate mold (of the OS variety) to increase production. Hopefully they don't have 2 different molds that are still in production and the less OS one's are simply old stock that are still finding there way out onto the course.