Designed by Jeff Levine, Show Card Elite JNL is an art nouveau and display sans font family. This typeface has two styles and was published by Jeff Levine Fonts.
One example in the 1919 instructional book “One Hundred Alphabets for the Show Card Writer” was for an elegant sans serif with a subtle Art Nouveau style to the letter forms.
This is now available digitally as Show Card Elite JNL in both regular and oblique versions.