That is a nice thing to find in an attic. I don’t think that it could have been hidden there very long. The grips appear to be either modern reproductions like Altamonte or Taiwan types rather than genuine S&W. Guns exposed to the variations in temperatures and humidity of an attic for long periods without proper protective measures tend to deteriorate over time.
Steelslaver, better check that coin again. Eisenhower was on the dollar coin rather than the half dollar. So, your find is worth twice as much as you thought.