Jackie Robinson Question

[steve B]

Those are actual post offices, and the cancels are handstamped as opposed to machine cancelled.

At one time, it was a popular thing among some stamp collectors to make clever stuff like this. Sometimes they made a bunch of them, sometimes only a few or one.
The post offices involved had to be ok with it, but at the time most would be.
Just find two towns with names that make what you want and self address an envelope or a few.
The smaller post offices were for quite some time paid a percentage of their mail volume, so they would go along with any legal scheme as long as they sold some stamps. So buy some stamps, put them on the envelope, and ask for them to be cancelled and handed back to you. (My local won't do this, as it may now be against regulations)Then go to the second town and repeat, making sure to leave enough room so the overall effect is not ugly.

It can/could also be done through the mail.