Library Book Initials JNL was modeled from examples of Sidney Gaunt’s Publicity Initials; originally sold in metal type by Barnhart Brothers and Spindler as a companion to the Publicity Gothic typeface.
The smoothed-down lines of the original characters allow for these initials to balace better when set against complementary type faces.
A regular version is on the upper case keys, with an oblique version on the lower case keys.