Thanks to all for the kind words and for posting your own examples. I am really looking forward to getting this one.
And thank you ! Surprisingly, despite my appreciation that so much knowledge has been lost through the ages, the 'mysterious' X (above the shields) still remains unclarified.
There are some really nice coins of Augustus in this thread. Thanks to all for all the learning one can gather from such threads. Here are two more of mine - pictures only. (ps- I am not being too lazy to post the proper attributions - it is just that my wife is calling me to do the chores around the house...i am on borrowed time...)