The first 24’s that I knew about had a round button barrel selector on the side. Then mine has the barrel selector on the hammer itself and the opening lever behind the hammer. Is the OP’s opening lever on the side version an earlier or later version? I can’t help on the value because I’m always surprised at what people are willing to pay for these things.

My other auto is a .45

The bitterness of poor quality is remembered long after the sweetness of low price has faded from memory