I have a recently acquired 686-4 six shot with a 4". LGS OTD was $525.00 in excellent shape and I love it !
Bargain for what you can -- but buy it now ! At that price - you can always re- sell for that price.
I Bet if you wait two more days it will be gone !
I wish I could have gotten mine for that price. If you are serious - you found a 686-4P for $575 you should have already bought it. That is a bargain. I hope you already got it or are on your way to go get it.