A letter to the editor in the Jamaica Gleaner signs off with:

I am, etc.,
MIDDLETON WILSON
middletonwilson@bellsoputh.ne
Miami, FL

What does "I am, etc." mean? I have a guess, and a Google search confirms it:

It means:
"I am, and remain, your most obediant servant, and await your answer with attentive blah blah blah blah blah."

As I thought.