A 520 is on my want list. They were initially made for the New York State Police. Before they were going to accept them the NYSP decided to purchase the model 28 instead. I like to collect S&W revolvers with police markings. Even though this model was never issued it would be nice to have.
As to my own story I wish I could have purchased a shooter grade Colt Python a few years ago for $500. It was a few months before my 21st birthday. There was nothing I could do
A long while back, I was at the Hoopeston Gun Show looking for a Garand. I saw a mint 1865 Spencer carbine for $250. I thought I would look the rest of the gun show over and if I didn't find a Garand I would come back and buy the Spencer. When I came back to that table it was gone. Someone else had already snatched it up. I'll always regret not buying that Spencer.