I asked that back in August but still remain ignorant. Although I did some calculations and eliminated quantum tunneling! But really, why is it rippled?
Here's a new 43-D DDO that I need to send in for listing. Shows up strong on LIBERTY. Shot with my new Stack and Stitch system. Try zooming-in all the way, it stays sharp from full coin all the way to fine details... https://easyzoom.com/image/125250
Those aren't flow lines they have to do with the plating process. Possibly minor linear plating blisters or the way the planchets are prepared before plating.
Thanks for clearing this up. I thought I had been misinformed for years about the appearance of flow lines.
Nice find! Condition aside am I correct to call this a partial out of collar strike? The obverse rim from 2-5 o'clock and 10-12 o'clock add character. It may not be a major error but certainly a cool keeper in my book. And the cost? Priceless! Happy hunting!
Here are a couple of coins that show what flow lines look like: https://easyzoom.com/image/125112 https://easyzoom.com/image/124774
And here's why I don't know how to grade. This looks absolutely perfect except a typically weak O on the reverse. If it had been MS65, MS66, or even MS67 it would have been easier to understand than MS64. Why not 68, really? Good thing I collect raw coins - they are what they are. Not that they are anything like this, of course.
If you look real closely at the 1987, there are steps but they are weak and indistinct. The steps come back in 1988. It’s as though the mint needed five years to figure out making the Zincoln proofs.