[Izzy Dunne]

You just go to the center (you measured it), then backspace once for every two characters or spaces....

I tried this. I counted 34 characters in the line
111th Fighter Interceptor Squadron

That puts the center between characters 17 and 18, if monospaced. ("t" and "e")
Then I counted 14 characters in the line
P.O. Box 34567

That puts the center between characters 7 and 8 ("o" and "x").

Draw a line between "t" and "e" on the first line, and between "o" and "x" on the second. The lines don't meet.

[Bryan24]

Great details work!!!

Furthermore, if you draw a line striaght down, the "o" would be dissected by the line.

[Robert A Cook PE]

Right!

See what I wrote in nbr 69.

[Spiff]

Brit Hume just covered something similar to this on Fox News Channnel. He showed the centered address on a document and the focused on the superscripted "th" in 87th Air something or other. The point he brought up is that the "th" was not only superscripted, it was tiny, the letter spacing was narrow, and that it matched perfectly the way Microsoft Word's Times New Roman font handles superscripting "th" after a number. He also said that no typewriter from that period could do that. He said that one of his producers typed the memo into Microsoft Word using the default spacing, margins, font, etc. and it came out spaced exactly the same as the letter.

[LibLieSlayer]

Sweeeeeeet!

LLS

[hford02]

I think your logic was correct on this test but can you duplicate non-proportionally spaced and non-kerned type on a word processor?