My grandfather had a Savage 24 that a widow had given him to pay him for some work he did for her (only plumber in a small town, and this wasn't unusual). Anyway, it was a .22lr/20ga with the top lever, connected barrels, no checkering or monte carlo stock. Any idea what exact model that was?
I have a 22lr/410 like you describe with the barrel selector being a button on the right side of the receiver that is pushed up or down to fire the rifle or shotgun barrel. The receiver is color case hardened. It is simply marked 'Model 24'. Mine was manufactured in 1961.
