Metalet Modern JNL was based on the letters found within the Metalet Movie Titling Set manufactured by the Modern Display Advertising Company of Hollywood, California circa the 1940s.

Each stamped metal letter would be affixed to the background surface via the use of miniature magnets. Once in place, titles for home movies or slides could be photographed, the letters then returned to their storage area in their box.

The character shapes show unusual stroke movement, which means the original models used for these letters were most likely hand-drawn.