Just to muddy the waters a little (I'm good at that!)- - - - -"AD" is also used on occasion to describe stovebolt trucks from the late 1930's and early 40's- - - - - -the "Art Deco" trucks. That's why the A-D description with the hyphen might be worth using.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!