Old mechanical jack. I threw one away a couple weeks ago with the scrap iron. Some are worth money if you can identify what car they are for, and it's one that's in demand such as a model A.
Look up and see if Model A or T an owner may want to buy as Concourse Car Tool Kit. I know some jacks got for $400-500 to complete a kit for specific cars. Not sure what an A or T might have had for a tool kit.