I've never seen any of those myself~ I cant think the quarter would be a mint error...will see what others say...
Since there is no Blakesley effect no I would guess that it was broke (damaged when in or coming out of the ground) Whats blakesley effect you ask ;o) http://board.conecaonline.org/showthread.php?t=2600
No for both of them, as someone already mentioned, the first has been spooned. And the second probably was machined or bacam so corroded and brittle, it broke off....