Now, here is an example for blog commenters.

From Letters of Note:

From Lt. Col. A.D. Wintle.
The Royal Dragoons
Cavalry Club
127 Piccadilly W.1.

To the Editor of The Times.

Sir,

I have just written you a long letter.

On reading it over, I have thrown it into the waste paper basket.

Hoping this will meet with your approval,

I am
Sir
Your obedient Servant

(Signed, ‘ADWintle’)

6 Feb ’46

I’ve just discovered this guy Wintle. He is now my hero.