Letterheady is a relatively new site that’s quickly become one of my favorites. It was started a few months ago by Shaun Usher, who also runs the wonderful Letters of Note.

Letterheady is devoted to posting interesting … well … what does it sound like?

A few of my favorite letterheads have been those belonging to Nikola Tesla, Harry Houdini, and Robot Salesmen. I liked the site so much I even decided to share old Marvel Comics letterhead with them.

Browsing the site today, I discovered letterhead for an event I’d never heard of before, something called Macy’s Superman Adventure.

Macy’s Superman Adventure? What the heck was that?

I have no idea. I feel as if I should, but I don’t. And except for a few vague facts, it doesn’t look as if the Internet has much of an idea, either.

Here are a few things I was able to discover.

I was able to find out that it was a 1940 promotional show sponsored by Macy’s Department Store and WOR Radio 710. (Though, of course, that was already apparent by the strip at the bottom of the sheet.)

I was able to find a letter which had been accompanied by two complimentary passes to the event given to semi-finalists from Superman Day at the 1939 New York World’s Fair. (Now that’s an event that’s been well-documented, since it was the first public appearance of Superman in costume.)

I was able to find a poster promising that “Before your eyes the World’s mightiest Comic Book and Radio hero COMES ALIVE in a spectacular action filled adventure for all ages.”

But what I wasn’t able to learn is … If I’d gone to Macy’s 5th floor, what would I have seen? What actually happened during that spectacular adventure?

I know that out there, someone knows. So—if you know, would you please let me know?

And would it be too much to hope for pictures?