Chariot Racing Help Needed

I have acquired the pictured silver belt buckle and have questions. It's one of those large (4 inches by 3 inches) and very well made belt buckles similar to those cowboys earn for bull riding or calf roping or bronc riding at major rodeos. This one, however, pictures two running horses, PULLING A CHARIOT!
I know there are chariot races held throughout the West and have searched the Web high and low and cannot locate a name that fits SRRA. The buckle is dated 1983 on the front. It was manufacured in German silver by the Montana Silversmiths of Columbus, Mont. My contact with them was brief, to the point of rudeness and completely helpless.
So, I'm turning to my reader with two questions:
1. What is the meaning of SRRA? 2. What does "1st Aged" mean?

Christmas Conundrum

As previously mentioned, I look for, and find, all kinds of old paper -- this piece was found rumpled up in the bottom of a box of old Christmas Cards. I'd opine it to be from the 1960s.

So, for my reader out there: May all your holidays be happy!

(Caution: Adult material ahead!)