Looking at the gun traders guide, a pythin in ex condition is anywhere from $510- $806, depending on the finish, though I'm sure with the .38, you would be looking at a higher real world price.
Gun traders guide was one of the best $13 I've spent. If you can get more details I'll look it up for you.
The finishes are:
Blue
Royal Blue
Nickel
Stainless
Ultimate Stainless
and there are also hunter and silhouette models, couldn't tell you differences between royal and ultimate and such though, probably "Purdier"