Robinett_11B:
Your Model 66 Combat Magnum Stainless was manufactured in 1975.
blackholegun:
If the serial number is S99968 (6 digits long,) not S99968x (seven digits long) then you have a .38/44 Outdoorsman Model of 1950 manufactured between 1953 & 1954. In 1957 this model was designated the Model 23.
In 2006 the Standard Catalog of S&W gave a value of $650 in excellent condition.
Value is heavily dependent on condition, so you should start a new thread and post pics if you want an idea of its current value.
To post pics log in, hit reply, click on manage attachments,
in the manage attachments dialog box that opens, go to "Upload File From Your Computer".
Click on browse, this will open a window for your files.
Click on the icon on the left that will take you to your pics, wether it is desktop, my documents, etc.
Double click on the picture.
This will bring you back to the manage attachments box. Do the same for another pic if needed.
Click upload in the manage attachments dialog box.
Then click close this window.
Then click submit reply.
Ignore the pic, it was chosen randomly while working out how to do attachments.