Hmm...
I am starting to suspect they may have cast them parallel, Being that some MKII's and some MKIII gone one, and some got the other.
Looking back ai my records, I have some MKIIIB's with the sharp edge, and some MKIIIA's with the smooth edge, as well as about a 50/50 slpit for the MKII's.
So its quite possible that it is original.
Also, I have an auto drive with the sharp edge...