Considering that the 'dot' is supposed to have been a deliberate mark rather than a die flaw, the "lighter thinner" variant must be a gradual infilling of the die, i.e. in an older state. I'm afraid I can't see the third dot at all (with the die crack) - how do you know it is there? Just spotted O'NE on eBay - item number 261617055626 I so want one....