Aside from being bodybagged, what's the worst you ever missed on a coin by?

I've seen posts where people got coins back a few points under what they thought, but what's the worst miss you've ever had (if you want to admit it!
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Looking for PCGS AU58 Washington's, 32-63.
When we are planning for posterity, we ought to remember that virtue is not hereditary.
Thomas Paine
I wish I would miss it on that side. WOW!
Russ, NCNE
Link to 1950 - 1964 Proof Registry Set
1938 - 1964 Proof Jeffersons w/ Varieties
Hmmm.....
rainbowroosie April 1, 2003
<< <i>Sent a great 43P merc for 67; came back 64....sent it again; came back 67 >>
Sounds like you didn't miss, they did. The question is, which time.
Sean Reynolds
"Keep in mind that most of what passes as numismatic information is no more than tested opinion at best, and marketing blather at worst. However, I try to choose my words carefully, since I know that you guys are always watching." - Joe O'Connor
As for raw coins when i was getting started in coin dealing i bought what i though was a MS65Red maybe RB large cent, anacs opened my eyes when i got back an AU details net VG, burnished/cleaned/tooled label on the slab. Lost my arse on that coin but was a good education and has saved me $ in the long run.
Andrew
Thankfully the gold in it was worth nearly what I paid for the coin. It was the last gold coin I ever purchased.
Joe.
Missed a tyII 1$ gold as not genuine. I thought the coin was a lock Au-58. Glad I only bought it for 125.00
However , two years prior I dropped out bidding on a 1855-C $1.00 gold in an estate auction becuase I was scared it was counterfiet, or at least ex-jewlry. Wrong, winning bidder submitted and got coin back in Au-53????