S&W 586: dash vs.no-dash models

I know the model 586 S&W is discontinued, but I held a beautiful one in my hand and decided if I wanted to shell out $499.00 (+tax and DROS).
I decided to ask around and everyone's opinion was based on whether or not it was a "dash one" or a "no dash". But nobody was specific about why, just that the "no dash" was preferable.
When I went back (of course it was sold), and the guy insisted it had been a 587 (7 shot) no dash. I asked him the difference; he didn't know, said his boss was the FFL - come back and ask him.
I said they must be holding the gun; could he check that 586/587 question (I thought we might be talking about different revolvers).
The conversation got 'pissy' so I figured I'd rather ask here than go back there.
Any experts?

 

586 Introduced (1981).
586-1 (1986) has radiused H & T stud durability package and floating hand.
586, or 586-1 with an M inside the crane (1987) Factory mod to eliminate problems with primer flow & cylinder binding.
586-2 (1987) has a different hammer design.
586-3 (1988) Different yoke retention system.

Here is the exact recall wording:

rc

 

There was a S&W announcement some time ago that they would be re-marketing some of their classic models. I think I'll stick with my original intention of getting a new Model 19 which will never see a magnum load -but could handle it.

 

The world is full of very nice pre-owned Model 19's & 66's at reasonable prices.

Without MIM parts, and infernal locks, and EDM rifling, a "new" classic will have, if they ever really do that with the Model 19.

rc