I dont have the key housing broken parts anymore. But it is just the housing that broke. I had to break the rest off to get the cylinder off. I soaked in vinegar for the rust, maybe that affected the zinc?
I should know better than to not include a picture of the keyhole. Here's the machine itself with the keyholes ;^)
The stamps that were in it were 1 cent and 5 cents if that helps with age.

