Help identifying this error on a 1920 Tercentenary Half Dollar?

There's something going on right at the top right side of the ship's stern on the reverse, also notice the doubling of the rim on both sides.
Not sure what's up with the obverse, weird damage across the front.
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Comments
Looks like a clash of the hat from the obverse. Maybe?
I would call the obverse PMD and, although not by any means certain, the letters impressed at the stern of the ship could be from the same event... the force of the obverse damage causing and imprint on the reverse... there appears to be traces on the ship as well... No idea how it was done. Cheers, RickO
Looks like it could be a die clash; specifically the 'D' in GOD and the 'U' in TRUST.
It's a die clash, meaning the dies came together without a planchet between them. This caused lettering from the obverse die to be imprinted on the reverse die, and was then transferred to the subsequently struck coins. It's not rare on these Pilgrim halves. Some collectors like it, others avoid these.
That's cool. I haven't seen that particular die clash before.
Thanks for the input... for some reason, it did not seem to be a die clash to me....just could not see a logical overlay to account for it... Cheers, RickO