A couple of questions, but I will try & help...
1) I see the curved spurs, which puts your kit in the 70s. Is this an early 70s 3-ply w/rings shell (clear or granitone interior), or later 70s 6-ply shell (clear interior)? If the latter, it could be a set that was produced before they started putting the rivets along the seams.
2) Are you sure this isn't a rewrap? If it's a 3-ply w/rings shell, I've rarely seen the type of seam seperation you have due to how Ludwig's wrap on these shells was actually started in as part of the ply-building process (I hope I described that right!) as well as the type of glue they used. There was usually a flat spot where the wrap actually started, and if it's a rewrap you can clearly see where the original wrap was cut off at the seem when looking down at the bearing edges.
I'm bought drums that someone had attempted to rewrap on occasion. I've seen people try to "butt" their seams together instead of overlapping them which almost always sooner-or-later results in seperation that your pictures seem to show.
Just my thoughts and hope they help.
BTW -- they still may be keepers, depending upon what you paid for them...
Bill