Here are some photos of one of the hinges/latches that I cleaned up. It was a nuisance to clean, but the chrome is excellent since it was under a wax/oil coating for over 70 years. Still could only find the patent number and no other ID. The plate visible on the bottom is spring loaded, so I believe this is some sort of a trunk or hood latch. I hope someone can recognize the part now that the shape is clear.