Yikes! That's a shame they've been pierced. I've seen some like that amongst out family's old coins. You'd think coins that old, over here, would be worth more, but one source says only about $14-16 for the 1857 dimes, as long as it still has rims on both sides and, I am sure, no holes.:-) There's some interesting pix, etc. HERE. The only coins we have that have had anything done to them is a gold piece my granddad had a pin attached to so my grandma could wear it and I have pennies in which my dad shot dead center holes when showing off his skills at target practice with his "six-shooter."