The one in the bottom of the photos cranks clockwise and counterclockwise.  The other does not turn.  Priced accordingly.

The Vintage Zim Mfg Hand Crank Valve Grinders Set Of 2, made in the USA by Zim Mfg. Co., are highly sought after collectibles for mechanics and tool enthusiasts. These hand crank valve grinders are a rare find, showcasing the quality craftsmanship and durability of American manufacturing. The set of 2 grinders allows for easy maintenance and repair of valves, making them a valuable addition to any tool collection.