That could well be the case, Kev and I very happily bow to your vastly superior knowledge of weights compared to mine.

It does look like the blue enamel, however added, was not done evenly or at the correct temperature.
I do have one of these Webb weights, a spider in the uranium casing. I have no idea if it is a first or a second, but I was surprised at the lack of finess in it.
It has a swirly layer of tiny bubbles in the dome, under the top facet, which make it appear scratched.