my old post card from 1913, and 1874 to 1920 german money,

my old post card from 1913, and 1874 to 1920 german money,
Ii found an old post card from 1913 it is very intresting and with that goerge washington, stamp, and but of coarse I have a few more stamps,
Like goerge Washington's wife,, and Roosevelt,, and benjamin franklin, and us air mail,
U will see later,, when I post it, and a letter I found,, its a letter from the army from world war 2, along with a dinner menu from 1940s u would like to see,
And then I have this old German money I would like to know more about,