(click on pictures to enlarge)
A few of these have been turning up on Ebay recently. They are marked on the clip with simply "Worlds Fair Chgo 1933," and were apparently intended to be sold as souveniers. If I had to guess who made them, I would say Moore, since they stylistically and mechanically are most similar to the "Moore Writer" series that came out around the same time.
World's Fair fans should also check out the Eversharp page for additional World's Fair memorabilia.