Those CDC guns were selling for $250ish around 2010 if that matters.
It’s a 2” stainless k frame which means it’s going to be harder for concealing but much happy at the range. Except it’s a snub nose so isn’t going to drive tacks at 50 feet. It’s stainless which means it’s easy to keep looking new but will never have the bluing that us Ruger guys look at with jealousy.
Before the whole pandemic Gun buying panic I was seeing some pristine blued S&W .38s in the $650 range which nearly got my money. Everything is sold out now in the private markets and the beat up old blued Smith beaters at the big box stores are marked up to $350 from $250 last year.
I don’t think it’s a great deal but if it’s in nice condition with good wood and a trigger you like and you want it you will get many years of enjoyment out of it. I predict you will be able to sell or trade it in 10 year for at least what you paid for it. If you like it, it’s worth what you pay for it! See if the seller can throw in ammunition, holster, dies, .38 bronze brushes, some other things to sweeten the deal for your $500. Rather than haggle over price, haggle over value. When I sell a gun, if I like the buyer and it’s a smooth transaction, I usually have associated Knick-knacks that another fella might like but are a bother to e-bay.
If you like it and it’s not trashed, it may be a fair deal for you.
There is a link somewhere for a revolver inspection checklist... Anyone have that handy?