Vintage Chinese Gambling Game

Collection of 60 highly graphic playing cards used for gambling purposes, accompanied by a letter written to Mrs E. Leonard from the Deputy Keeper of the Victoria and Albert Museum in 1964.  At that time one could send things to the V. and A. for identification purposes.  First half of the 20th century, Chinese.  From an old English collection.
Each card:
Height 9cm
Width 2cm