Frederik Pohl has a nice article about The Science Fiction League. I found an original SF League membership card on eBay and I made copies of it. I put a high resolution copy of the card into a standard printer business card template so you can print your own cards.

WARNING: this is nigh onto 30 megs of download and may take a while.

Print your own Membership Cards: Download Science Fiction League Membership card Template

Thanks to a reader, Dennis McCunney, there is a zip of the adobe PDF version that is a much smaller download of the Science Fiction League cards.

Here are the the images of the card.

The Way the Future Blogs, an online memoir by science fiction writer Frederik Pohl » Blog Archive » Let There Be Fandom: The Science Fiction League.