A pair of American Eagle Lugers from the estate of a good friend. I did end up with a 1944 1911A1 from that collection that apparently I've done well on.
Ljutic serial number 1111 with four aces artwork, a spare trigger, and a case. I could have had that in about 1985 for $1,300 but I just didn't have it. I last saw that gun in the rack at Jaqua's for a 'just slightly' higher price.
An as new Greener FH35. Again, lack of funds.
A Kimber Super America. I regularly kick myself over that.
How about an early GSI import Merkel 147E when they first arrived for about 2500? They have doubled.
I could go on...