There are a few things happening on this coin. That weird planchet weakness could probably only be confirmed as a tapered planchet by weighing the coin. The reason is that rim weakness like that on these is common and caused by them using low pressure to save the dies longevity. You can see the die already had a bad clash and they had to aggressively polish it out. As seen by the floating olive branches and the die polish in front and behind the head. So they have over polished it already and those letters in Liberty tend to not strike out at all when they are not using a lot of pressure. But that rim weakness on this coin does seem a bit stronger than normal, so it's probably only confirmable by weighing the coin. I've been buying a lot of tapered straight clipped planchets and trying to find a regular tapered planchet, I might have picked this one up to weigh it and see depending on the cost.