I snapped a couple of pictures of AA headstamps today while taking a break fron snow blowing.  Four degrees on the deck this morning.  Supposed to have the - sign tomorrow morning.  At any rate, the early AAs had the brand name spelled out and the AA logo on the head stamp --
A while later as Olin was moving towards consolidating their two ammunition lines they went to the W - W head stamp --
And by the way, what ever those red shells are in front of the AA box in the first picture, those aren't the shells that started life in that box!