You have an early example of the Model 925 DEFENDER series. Not many of these are seen with the "bobbed" grip frame and 4" barrel in .38 S&W. If you provide the letter(s) prefixed to the serial number, we can tell year of manufacture.
As your gun appears in the pictures to be in Good to V. Good condition and because of the scarcity of the combination of grip and barrel length - I'm pretty sure it would start around $200 RETAIL and go up from there. The "standard" later variation of the 925 with the 2 1/2" barrel (same grips) is found at retail in that price range.