My build is Oct 4 67 I think. Traveling so can't see my notes. I misread that 69 for sure.
So I contacted bluestar and they were very helpful. I sent them the pic above showing the weight slots and asked if he could check that dist. Here is the comment.
"checked it out,and the advance weights are the same as the image on the right.They have the slanted angle.Maybe slightly more rounded at the far end.They have the L15.5 stamped on them as well. The advance unit does not have a number,as far as i can tell,some did not. "
So my mystery NOS shaft looks correct.