See below some examples of Genjimon (left the symbol and right the image from a real print).

Chapter 6 - Suetsumuhana (print from Kunisada - 1854)

Chapter 13 - Akashi (print from Kunisada - 1854)

Chapter 19 - Usugumo (print from Kunisada II - 1864)

Chapter 25 - Hotaru (print from Kunisada - 1854)