Frank X. Leyendecker signature

Frank X. Leyendecker (FX Leyendecker) was an American  illustrator. Well known for his work in the original LIFE magazine, and many other illsutratated magazines from the early part of the 20th century. He worked with his brother J. C. Leyendecker in Chicago and New York City.

FX Leyendecker on the internet:
Check Frank Leyendecker prices
Wikipedia entry
Nice collection of his work at the America Artwork Archives
FX Leyendecker artwork in the original Life magazine, March 9, 1922