You described the base as ground - and it looks ground in the pic, sorry for any confusion I caused!
There is clearly no pontil mark left at all, and you say it's highly polished. It may still be a second - given the swirls are not all evenly spaced - it can be very, very hard sometimes to tell a second from a "first". I do have a couple of "Limited Edition" (of 250 bits) but they're seconds and completely unmarked. I don't know all the ins and outs of how things were marked, quite frankly.
It's not something from any normal major range!