US coinage querstion: why "FIVE CENTS" and not "5¢" or "5 CENTS"?

I stand corrected. If I had had my Red Book with me, I would not have misspoken.

Well, I may not be able to help out with the money question, but here is how you type a “¢” character – hold down the ALT key and type 0162 on the keypad. (The Character Map accessory in Windows will generally allow you to locate, copy and paste a particular character, and will also tell you the “ALT+nnnn” keycode for it.)

Thanks! That’s a big help. Now I’ll be able to do accents, umlauts, and all those things too, right?

Yes. See here for a
printable (pdf) chart of these Windows shortcuts.

Or buy a Mac, and type: option $.

Regarding coin denominations, back in 1883 the mint started releasing the “Liberty Head” nickels, with a big “V” on the reverse. Some people gold plated them and passing them off as $5 gold pieces. So the mint stopped production, and added the word “cents” at the bottom of the reverse. AFAIK, the original was the only US coin with an ambiguous denomination.