The so-called 5-screw setup was used on all Smith & Wesson hand ejector models from the late 1890's forward to the middle-late 1940's. So 5-screw doesn't denote or identify a particular model. To do that a much more complete description is needed, plus the serial number stamped on the butt. Also include any letters, such as "V", "S", or "C" that might be there along with the number.
If you are looking at a 6-shot .38 Special, with a barrel length between 2 to 6 inches, that has fixed sights, you probably have a .38 Military & Police model. In the condition you described it would likely be worth the asking price. But without more information there isn't much more I can tell you, and what I have may be wrong.