This recent find is an Antique Eastlake Surface Mount Spring Loaded Pocket Door Dead Bolt Lock. I'm not actually sure if this was for a pocket door or not but it's built for rugged use and the spring mechanism works perfectly. I think you would depress the lock with your foot and release it by tapping the button with the toe of your shoe. This in good shape with surface rust. Please look at all the pictures carefully and ask any questions you may have.